3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
6 * this software and associated documentation files (the "Software"), to deal in
7 * the Software without restriction, including without limitation the rights to
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
9 * the Software, and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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22 * http://aws.amazon.com/freertos
23 * http://www.FreeRTOS.org
26 #ifndef FREERTOS_TCP_IP_H
27 #define FREERTOS_TCP_IP_H
33 BaseType_t xProcessReceivedTCPPacket( NetworkBufferDescriptor_t *pxNetworkBuffer );
35 typedef enum eTCP_STATE {
36 /* Comments about the TCP states are borrowed from the very useful
38 * http://en.wikipedia.org/wiki/Transmission_Control_Protocol */
39 eCLOSED = 0u, /* 0 (server + client) no connection state at all. */
40 eTCP_LISTEN, /* 1 (server) waiting for a connection request
41 from any remote TCP and port. */
42 eCONNECT_SYN, /* 2 (client) internal state: socket wants to send
44 eSYN_FIRST, /* 3 (server) Just created, must ACK the SYN request. */
45 eSYN_RECEIVED, /* 4 (server) waiting for a confirming connection request
46 acknowledgement after having both received and sent a connection request. */
47 eESTABLISHED, /* 5 (server + client) an open connection, data received can be
48 delivered to the user. The normal state for the data transfer phase of the connection. */
49 eFIN_WAIT_1, /* 6 (server + client) waiting for a connection termination request from the remote TCP,
50 or an acknowledgement of the connection termination request previously sent. */
51 eFIN_WAIT_2, /* 7 (server + client) waiting for a connection termination request from the remote TCP. */
52 eCLOSE_WAIT, /* 8 (server + client) waiting for a connection termination request from the local user. */
53 eCLOSING, /* (server + client) waiting for a connection termination request acknowledgement from the remote TCP. */
54 eLAST_ACK, /* 9 (server + client) waiting for an acknowledgement of the connection termination request
55 previously sent to the remote TCP
56 (which includes an acknowledgement of its connection termination request). */
57 eTIME_WAIT, /* 10 (either server or client) waiting for enough time to pass to be sure the remote TCP received the
58 acknowledgement of its connection termination request. [According to RFC 793 a connection can
59 stay in TIME-WAIT for a maximum of four minutes known as a MSL (maximum segment lifetime).] */
67 #endif /* FREERTOS_TCP_IP_H */