/* * FreeRTOS+TCP * Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * SPDX-License-Identifier: MIT * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * http://aws.amazon.com/freertos * http://www.FreeRTOS.org */ /** * @file FreeRTOS_TCP_State_Handling_IPv6.c * @brief Module which handles the TCP protocol state transition for FreeRTOS+TCP. * * Endianness: in this module all ports and IP addresses are stored in * host byte-order, except fields in the IP-packets */ /* Standard includes. */ #include #include /* FreeRTOS includes. */ #include "FreeRTOS.h" #include "task.h" #include "queue.h" #include "semphr.h" /* FreeRTOS+TCP includes. */ #include "FreeRTOS_IP.h" #include "FreeRTOS_Sockets.h" #include "FreeRTOS_IP_Private.h" #include "FreeRTOS_UDP_IP.h" #include "FreeRTOS_DHCP.h" #include "NetworkInterface.h" #include "NetworkBufferManagement.h" #include "FreeRTOS_ARP.h" #include "FreeRTOS_TCP_Reception.h" #include "FreeRTOS_TCP_Transmission.h" #include "FreeRTOS_TCP_State_Handling.h" #include "FreeRTOS_TCP_Utils.h" /* Just make sure the contents doesn't get compiled if TCP is not enabled. */ /* *INDENT-OFF* */ #if( ipconfigUSE_IPv6 != 0 ) && ( ipconfigUSE_TCP == 1 ) /* *INDENT-ON* */ /** * @brief Handle 'listen' event on the given socket. * * @param[in] pxSocket The socket on which the listen occurred. * @param[in] pxNetworkBuffer The network buffer carrying the packet. * * @return If a new socket/duplicate socket is created, then the pointer to * that socket is returned or else, a NULL pointer is returned. */ FreeRTOS_Socket_t * prvHandleListen_IPV6( FreeRTOS_Socket_t * pxSocket, NetworkBufferDescriptor_t * pxNetworkBuffer ) { const TCPPacket_IPv6_t * pxTCPPacket = NULL; FreeRTOS_Socket_t * pxReturn = NULL; uint32_t ulInitialSequenceNumber = 0; BaseType_t xHasSequence = pdFALSE; if( ( pxSocket != NULL ) && ( pxNetworkBuffer != NULL ) ) { /* Map the ethernet buffer onto a TCPPacket_IPv6_t struct for easy access to the fields. */ /* MISRA Ref 11.3.1 [Misaligned access] */ /* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */ /* coverity[misra_c_2012_rule_11_3_violation] */ pxTCPPacket = ( ( const TCPPacket_IPv6_t * ) pxNetworkBuffer->pucEthernetBuffer ); configASSERT( pxNetworkBuffer->pxEndPoint != NULL ); /* Silently discard a SYN packet which was not specifically sent for this node. */ if( memcmp( pxTCPPacket->xIPHeader.xDestinationAddress.ucBytes, pxNetworkBuffer->pxEndPoint->ipv6_settings.xIPAddress.ucBytes, ipSIZE_OF_IPv6_ADDRESS ) == 0 ) { /* Assume that a new Initial Sequence Number will be required. Request * it now in order to fail out if necessary. */ if( xApplicationGetRandomNumber( &ulInitialSequenceNumber ) == pdPASS ) { xHasSequence = pdTRUE; } } } /* A pure SYN (without ACK) has come in, create a new socket to answer * it. */ if( xHasSequence != pdFALSE ) { if( pxSocket->u.xTCP.bits.bReuseSocket != pdFALSE_UNSIGNED ) { /* The flag bReuseSocket indicates that the same instance of the * listening socket should be used for the connection. */ pxReturn = pxSocket; pxSocket->u.xTCP.bits.bPassQueued = pdTRUE_UNSIGNED; pxSocket->u.xTCP.pxPeerSocket = pxSocket; } else { /* The socket does not have the bReuseSocket flag set meaning create a * new socket when a connection comes in. */ pxReturn = NULL; if( pxSocket->u.xTCP.usChildCount >= pxSocket->u.xTCP.usBacklog ) { FreeRTOS_printf( ( "Check: Socket %u already has %u / %u child%s\n", pxSocket->usLocalPort, pxSocket->u.xTCP.usChildCount, pxSocket->u.xTCP.usBacklog, ( pxSocket->u.xTCP.usChildCount == 1U ) ? "" : "ren" ) ); ( void ) prvTCPSendReset( pxNetworkBuffer ); } else { FreeRTOS_Socket_t * pxNewSocket = ( FreeRTOS_Socket_t * ) FreeRTOS_socket( FREERTOS_AF_INET6, FREERTOS_SOCK_STREAM, FREERTOS_IPPROTO_TCP ); /* MISRA Ref 11.4.1 [Socket error and integer to pointer conversion] */ /* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-114 */ /* coverity[misra_c_2012_rule_11_4_violation] */ if( ( pxNewSocket == NULL ) || ( pxNewSocket == FREERTOS_INVALID_SOCKET ) ) { FreeRTOS_debug_printf( ( "TCP: Listen: new socket failed\n" ) ); ( void ) prvTCPSendReset( pxNetworkBuffer ); } else if( prvTCPSocketCopy( pxNewSocket, pxSocket ) != pdFALSE ) { /* The socket will be connected immediately, no time for the * owner to setsockopt's, therefore copy properties of the server * socket to the new socket. Only the binding might fail (due to * lack of resources). */ pxReturn = pxNewSocket; } else { /* Copying failed somehow. */ } } } } if( ( xHasSequence != pdFALSE ) && ( pxReturn != NULL ) ) { size_t xCopyLength; const IPHeader_IPv6_t * pxIPHeader_IPv6; /* Map the byte stream onto the ProtocolHeaders_t for easy access to the fields. */ /* MISRA Ref 11.3.1 [Misaligned access] */ /* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */ /* coverity[misra_c_2012_rule_11_3_violation] */ const ProtocolHeaders_t * pxProtocolHeaders = ( ( const ProtocolHeaders_t * ) &( pxNetworkBuffer->pucEthernetBuffer[ ipSIZE_OF_ETH_HEADER + uxIPHeaderSizePacket( pxNetworkBuffer ) ] ) ); pxReturn->pxEndPoint = pxNetworkBuffer->pxEndPoint; pxReturn->bits.bIsIPv6 = pdTRUE_UNSIGNED; /* MISRA Ref 11.3.1 [Misaligned access] */ /* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-113 */ /* coverity[misra_c_2012_rule_11_3_violation] */ pxIPHeader_IPv6 = ( ( const IPHeader_IPv6_t * ) &( pxNetworkBuffer->pucEthernetBuffer[ ipSIZE_OF_ETH_HEADER ] ) ); pxReturn->u.xTCP.usRemotePort = FreeRTOS_ntohs( pxTCPPacket->xTCPHeader.usSourcePort ); ( void ) memcpy( pxReturn->u.xTCP.xRemoteIP.xIP_IPv6.ucBytes, pxIPHeader_IPv6->xSourceAddress.ucBytes, ipSIZE_OF_IPv6_ADDRESS ); pxReturn->u.xTCP.xTCPWindow.ulOurSequenceNumber = ulInitialSequenceNumber; /* Here is the SYN action. */ pxReturn->u.xTCP.xTCPWindow.rx.ulCurrentSequenceNumber = FreeRTOS_ntohl( pxProtocolHeaders->xTCPHeader.ulSequenceNumber ); prvSocketSetMSS( pxReturn ); prvTCPCreateWindow( pxReturn ); vTCPStateChange( pxReturn, eSYN_FIRST ); /* Make a copy of the header up to the TCP header. It is needed later * on, whenever data must be sent to the peer. */ if( pxNetworkBuffer->xDataLength > sizeof( pxReturn->u.xTCP.xPacket.u.ucLastPacket ) ) { xCopyLength = sizeof( pxReturn->u.xTCP.xPacket.u.ucLastPacket ); } else { xCopyLength = pxNetworkBuffer->xDataLength; } ( void ) memcpy( ( void * ) pxReturn->u.xTCP.xPacket.u.ucLastPacket, ( const void * ) pxNetworkBuffer->pucEthernetBuffer, xCopyLength ); } return pxReturn; } /*-----------------------------------------------------------*/ /* *INDENT-OFF* */ #endif /* ( ipconfigUSE_IPv6 != 0 ) && ( ipconfigUSE_TCP == 1 ) */ /* *INDENT-ON* */