1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** NetX Component */ 17 /** */ 18 /** Transmission Control Protocol (TCP) */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define NX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "nx_api.h" 29 #include "nx_ip.h" 30 #include "nx_tcp.h" 31 32 33 /* Bring in externs for caller checking code. */ 34 35 NX_CALLER_CHECKING_EXTERNS 36 37 38 /**************************************************************************/ 39 /* */ 40 /* FUNCTION RELEASE */ 41 /* */ 42 /* _nxe_tcp_free_port_find PORTABLE C */ 43 /* 6.1 */ 44 /* AUTHOR */ 45 /* */ 46 /* Yuxin Zhou, Microsoft Corporation */ 47 /* */ 48 /* DESCRIPTION */ 49 /* */ 50 /* This function checks for errors in the TCP free port find */ 51 /* function call. */ 52 /* */ 53 /* INPUT */ 54 /* */ 55 /* ip_ptr IP instance pointer */ 56 /* port Starting port */ 57 /* free_port_ptr Pointer to return free port */ 58 /* */ 59 /* OUTPUT */ 60 /* */ 61 /* status Completion status */ 62 /* */ 63 /* CALLS */ 64 /* */ 65 /* _nx_tcp_free_port_find Actual TCP free port find */ 66 /* function */ 67 /* */ 68 /* CALLED BY */ 69 /* */ 70 /* Application Code */ 71 /* */ 72 /* RELEASE HISTORY */ 73 /* */ 74 /* DATE NAME DESCRIPTION */ 75 /* */ 76 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 77 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 78 /* resulting in version 6.1 */ 79 /* */ 80 /**************************************************************************/ _nxe_tcp_free_port_find(NX_IP * ip_ptr,UINT port,UINT * free_port_ptr)81UINT _nxe_tcp_free_port_find(NX_IP *ip_ptr, UINT port, UINT *free_port_ptr) 82 { 83 84 UINT status; 85 86 87 /* Check for invalid input pointers. */ 88 if ((ip_ptr == NX_NULL) || (ip_ptr -> nx_ip_id != NX_IP_ID) || (free_port_ptr == NX_NULL)) 89 { 90 return(NX_PTR_ERROR); 91 } 92 93 /* Check to see if TCP is enabled. */ 94 if (!ip_ptr -> nx_ip_tcp_packet_receive) 95 { 96 return(NX_NOT_ENABLED); 97 } 98 99 /* Check for an invalid port. */ 100 if (((ULONG)port) > (ULONG)NX_MAX_PORT) 101 { 102 return(NX_INVALID_PORT); 103 } 104 105 /* Check for appropriate caller. */ 106 NX_THREADS_ONLY_CALLER_CHECKING 107 108 /* Call actual TCP free port find function. */ 109 status = _nx_tcp_free_port_find(ip_ptr, port, free_port_ptr); 110 111 /* Return completion status. */ 112 return(status); 113 } 114 115
