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ThreadX4TGFS/port/threadx/inc/nx_user.h

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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** User Specific */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* PORT SPECIFIC C INFORMATION RELEASE */
/* */
/* nx_user.h PORTABLE C */
/* 6.4.3 */
/* */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file contains user defines for configuring NetX in specific */
/* ways. This file will have an effect only if the application and */
/* NetX library are built with NX_INCLUDE_USER_DEFINE_FILE defined. */
/* Note that all the defines in this file may also be made on the */
/* command line when building NetX library and application objects. */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* 08-02-2021 Yuxin Zhou Modified comment(s), and */
/* supported TCP/IP offload, */
/* resulting in version 6.1.8 */
/* 04-25-2022 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1.11 */
/* 10-31-2023 Tiejun Zhou Modified comment(s), */
/* supported random IP id, */
/* resulting in version 6.3.0 */
/* */
/**************************************************************************/
#ifndef NX_USER_H
#define NX_USER_H
/* Define the base exponent of 2 for huge number.
* Only 16 and 32 are supported. */
#define NX_CRYPTO_HUGE_NUMBER_BITS 32
#define NX_DIRECT_ISR_CALL 1
/* Define various build options for the NetX Duo port. The application should either make changes
here by commenting or un-commenting the conditional compilation defined OR supply the defines
though the compiler's equivalent of the -D option. */
/* Override various options with default values already assigned in nx_api.h or nx_port.h. Please
also refer to nx_port.h for descriptions on each of these options. */
/* Configuration options for Interface */
/* NX_MAX_PHYSICAL_INTERFACES defines the number physical network interfaces
present to NetX Duo IP layer. Physical interface does not include
loopback interface. By default there is at least one physical interface
in the system. */
#define NX_MAX_PHYSICAL_INTERFACES 2
/* Defined, this option disables NetX Duo support on the 127.0.0.1 loopback interface.
127.0.0.1 loopback interface is enabled by default. Uncomment out the follow code to disable
the loopback interface. */
/*
#define NX_DISABLE_LOOPBACK_INTERFACE
*/
/* If defined, the link driver is able to specify extra capability, such as checksum offloading features. */
/*
#define NX_ENABLE_INTERFACE_CAPABILITY
*/
/* Configuration options for IP */
/* This defines specifies the number of ThreadX timer ticks in one second. The default value is based
on ThreadX timer interrupt. */
#ifdef TX_TIMER_TICKS_PER_SECOND
#define NX_IP_PERIODIC_RATE TX_TIMER_TICKS_PER_SECOND
#else
#define NX_IP_PERIODIC_RATE 100
#endif
/* Defined, NX_ENABLE_IP_RAW_PACKET_FILTER allows an application to install a filter
for incoming raw packets. This feature is disabled by default. */
/*
#define NX_ENABLE_IP_RAW_PACKET_FILTER
*/
/* This define specifies the maximum number of RAW packets can be queued for receive. The default
value is 20. */
/*
#define NX_IP_RAW_MAX_QUEUE_DEPTH 20
*/
/* Defined, this option enables IP static routing feature. By default IP static routing
feature is not compiled in. */
/*
#define NX_ENABLE_IP_STATIC_ROUTING
*/
/* This define specifies the size of IP routing table. The default value is 8. */
/*
#define NX_IP_ROUTING_TABLE_SIZE 8
*/
/* Defined, this option enables random IP id. By default IP id is increased by one for each packet. */
/*
#define NX_ENABLE_IP_ID_RANDOMIZATION
*/
/* This define specifies the maximum number of multicast groups that can be joined.
The default value is 7. */
/*
#define NX_MAX_MULTICAST_GROUPS 7
*/
/* Configuration options for IPv6 */
/* Disable IPv6 processing in NetX Duo. */
/*
#define NX_DISABLE_IPV6
*/
/* Define the number of entries in IPv6 address pool. */
/*
#ifdef NX_MAX_PHYSICAL_INTERFACES
#define NX_MAX_IPV6_ADDRESSES (NX_MAX_PHYSICAL_INTERFACES * 3)
#endif
*/
/* Do not process IPv6 ICMP Redirect Messages. */
/*
#define NX_DISABLE_ICMPV6_REDIRECT_PROCESS
*/
/* Do not process IPv6 Router Advertisement Messages. */
/*
#define NX_DISABLE_ICMPV6_ROUTER_ADVERTISEMENT_PROCESS
*/
/* Do not send IPv6 Router Solicitation Messages. */
/*
#define NX_DISABLE_ICMPV6_ROUTER_SOLICITATION
*/
/* Define the max number of router solicitations a host sends until a router response
is received. If no response is received, the host concludes no router is present. */
/*
#define NX_ICMPV6_MAX_RTR_SOLICITATIONS 3
*/
/* Define the interval between which the host sends router solicitations in seconds. */
/*
#define NX_ICMPV6_RTR_SOLICITATION_INTERVAL 4
*/
/* Define the maximum delay for the initial router solicitation in seconds. */
/*
#define NX_ICMPV6_RTR_SOLICITATION_DELAY 1
*/
/* Do not send ICMPv4 Error Messages. */
/*
#define NX_DISABLE_ICMPV4_ERROR_MESSAGE
*/
/* Do not send ICMPv6 Error Messages. */
/*
#define NX_DISABLE_ICMPV6_ERROR_MESSAGE
*/
/* Disable the Duplicate Address Detection (DAD) protocol when configuring the host IP address. */
/*
#define NX_DISABLE_IPV6_DAD
*/
/* If defined, application is able to control whether or not to perform IPv6 stateless
address autoconfiguration with nxd_ipv6_stateless_address_autoconfig_enable() or
nxd_ipv6_stateless_address_autoconfig_disable() service. If defined, the system starts
with IPv6 stateless address autoconfiguration enabled. This feature is disabled by default. */
/*
#define NX_IPV6_STATELESS_AUTOCONFIG_CONTROL
*/
/* If enabled, application is able to install a callback function to get notified
when an interface IPv6 address is changed. By default this feature is disabled. */
/*
#define NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY
*/
/* Defined, this option prevents NetX Duo from removing stale (old) cache table entries
whose timeout has not expired so are otherwise still valid) to make room for new entries
when the table is full. Static and router entries are not purged. */
/*
#define NX_DISABLE_IPV6_PURGE_UNUSED_CACHE_ENTRIES
*/
/* This define enables simple IPv6 multicast group join/leave function. By default
the IPv6 multicast join/leave function is not enabled. */
/*
#define NX_ENABLE_IPV6_MULTICAST
*/
/* Defined, Minimum Path MTU Discovery feature is enabled. */
/*
#define NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
*/
/* Define wait interval in seconds to reset the path MTU for a destination
table entry after decreasing it in response to a packet too big error message.
RFC 1981 Section 5.4 states the minimum time to wait is
5 minutes and recommends 10 minutes.
*/
/*
#define NX_PATH_MTU_INCREASE_WAIT_INTERVAL 600
*/
/* Configuration options for Neighbor Discovery. */
/* Define values used for Neighbor Discovery protocol.
The default values are suggested by RFC2461, chapter 10. */
/* Define the maximum number of multicast Neighbor Solicitation packets
NetX Duo sends for a packet destination needing physical mapping
to the IP address. */
/*
#define NX_MAX_MULTICAST_SOLICIT 3
*/
/* Define the maximum number of unicast Neighbor Solicitation packets
NetX Duo sends for a cache entry whose reachable time has expired
and gone "stale". */
/*
#define NX_MAX_UNICAST_SOLICIT 3
*/
/* Define the length of time, in seconds, that a Neighbor Cache table entry
remains in the reachable state before it becomes state. */
/*
#define NX_REACHABLE_TIME 30
*/
/* Define the length of time, in milliseconds, between retransmitting
Neighbor Solicitation (NS) packets. */
/*
#define NX_RETRANS_TIMER 1000
*/
/* Define the length of time, in seconds, for a Neighbor Cache entry
to remain in the Delay state. This is the Delay first probe timer. */
/*
#define NX_DELAY_FIRST_PROBE_TIME 5
*/
/* This defines specifies the maximum number of packets that can be queued while waiting for a
Neighbor Discovery to resolve an IPv6 address. The default value is 4. */
/*
#define NX_ND_MAX_QUEUE_DEPTH 4
*/
/* Define the maximum ICMPv6 Duplicate Address Detect Transmit . */
/*
#define NX_IPV6_DAD_TRANSMITS 3
*/
/* Define the number of neighbor cache entries. */
/*
#define NX_IPV6_NEIGHBOR_CACHE_SIZE 16
*/
/* Define the size of the IPv6 destination table. */
/*
#define NX_IPV6_DESTINATION_TABLE_SIZE 8
*/
/* Define the size of the IPv6 prefix table. */
/*
#define NX_IPV6_PREFIX_LIST_TABLE_SIZE 8
*/
/* Configuration options for IPSEC */
/* This define enables IPSEC in NetX Duo. */
/*
#define NX_IPSEC_ENABLE
*/
/* Configuration options for NAT */
/* This define enables NAT process in NetX Duo. */
/*
#define NX_NAT_ENABLE
*/
/* Configuration options for IGMP */
/* Defined, IGMP v2 support is disabled. By default NetX Duo
is built with IGMPv2 enabled . By uncommenting this option,
NetX Duo reverts back to IGMPv1 only. */
/*
#define NX_DISABLE_IGMPV2
*/
/* Configuration options for ARP */
/* When defines, ARP reply is sent when address conflict occurs. */
/*
#define NX_ARP_DEFEND_BY_REPLY
*/
/* To use the ARP collision handler to check for invalid ARP messages
matching existing entries in the table (man in the middle attack),
enable this feature. */
/*
#define NX_ENABLE_ARP_MAC_CHANGE_NOTIFICATION
*/
/* This define specifies the number of seconds ARP entries remain valid. The default value of 0 disables
aging of ARP entries. */
/*
#define NX_ARP_EXPIRATION_RATE 0
*/
/* This define specifies the number of seconds between ARP retries. The default value is 10, which represents
10 seconds. */
/*
#define NX_ARP_UPDATE_RATE 10
*/
/* This define specifies the maximum number of ARP retries made without an ARP response. The default
value is 18. */
/*
#define NX_ARP_MAXIMUM_RETRIES 18
*/
/* This defines specifies the maximum number of packets that can be queued while waiting for an ARP
response. The default value is 4. */
/*
#define NX_ARP_MAX_QUEUE_DEPTH 4
*/
/* Defined, this option disables entering ARP request information in the ARP cache. */
/*
#define NX_DISABLE_ARP_AUTO_ENTRY
*/
/* Define the ARP defend interval. The default value is 10 seconds. */
/*
#define NX_ARP_DEFEND_INTERVAL 10
*/
/* Configuration options for TCP */
/* This define specifies how the number of system ticks (NX_IP_PERIODIC_RATE) is divided to calculate the
timer rate for the TCP delayed ACK processing. The default value is 5, which represents 200ms. */
/*
#define NX_TCP_ACK_TIMER_RATE 5
*/
/* This define specifies how the number of system ticks (NX_IP_PERIODIC_RATE) is divided to calculate the
fast TCP timer rate. The fast TCP timer is used to drive various TCP timers, including the delayed ACK
timer. The default value is 10, which represents 100ms. */
/*
#define NX_TCP_FAST_TIMER_RATE 10
*/
/* This define specifies how the number of system ticks (NX_IP_PERIODIC_RATE) is divided to calculate the
timer rate for the TCP transmit retry processing. The default value is 1, which represents 1 second. */
/*
#define NX_TCP_TRANSMIT_TIMER_RATE 1
*/
/* This define specifies how many seconds of inactivity before the keepalive timer activates. The default
value is 7200, which represents 2 hours. */
/*
#define NX_TCP_KEEPALIVE_INITIAL 7200
*/
/* This define specifies how many seconds between retries of the keepalive timer assuming the other side
of the connection is not responding. The default value is 75, which represents 75 seconds between
retries. */
/*
#define NX_TCP_KEEPALIVE_RETRY 75
*/
/* This define specifies the maximum packets that are out of order. The default value is 8. */
/*
#define NX_TCP_MAX_OUT_OF_ORDER_PACKETS 8
*/
/* This define specifies the maximum number of TCP server listen requests. The default value is 10. */
/*
#define NX_MAX_LISTEN_REQUESTS 10
*/
/* Defined, this option enables the optional TCP keepalive timer. */
/*
#define NX_ENABLE_TCP_KEEPALIVE
*/
/* Defined, this option enables the optional TCP immediate ACK response processing. */
/*
#define NX_TCP_IMMEDIATE_ACK
*/
/* This define specifies the number of TCP packets to receive before sending an ACK. */
/* The default value is 2: ack every 2 packets. */
/*
#define NX_TCP_ACK_EVERY_N_PACKETS 2
*/
/* Automatically define NX_TCP_ACK_EVERY_N_PACKETS to 1 if NX_TCP_IMMEDIATE_ACK is defined.
This is needed for backward compatibility. */
#if(defined(NX_TCP_IMMEDIATE_ACK) && !defined(NX_TCP_ACK_EVERY_N_PACKETS))
#define NX_TCP_ACK_EVERY_N_PACKETS 1
#endif
/* This define specifies how many transmit retires are allowed before the connection is deemed broken.
The default value is 10. */
/*
#define NX_TCP_MAXIMUM_RETRIES 10
*/
/* This define specifies the maximum depth of the TCP transmit queue before TCP send requests are
suspended or rejected. The default value is 20, which means that a maximum of 20 packets can be in
the transmit queue at any given time. */
/*
#define NX_TCP_MAXIMUM_TX_QUEUE 20
*/
/* This define specifies how the retransmit timeout period changes between successive retries. If this
value is 0, the initial retransmit timeout is the same as subsequent retransmit timeouts. If this
value is 1, each successive retransmit is twice as long. The default value is 0. */
/*
#define NX_TCP_RETRY_SHIFT 0
*/
/* This define specifies how many keepalive retries are allowed before the connection is deemed broken.
The default value is 10. */
/*
#define NX_TCP_KEEPALIVE_RETRIES 10
*/
/* Defined, this option enables the TCP window scaling feature. (RFC 1323). Default disabled. */
/*
#define NX_ENABLE_TCP_WINDOW_SCALING
*/
/* Defined, this option disables the reset processing during disconnect when the timeout value is
specified as NX_NO_WAIT. */
/*
#define NX_DISABLE_RESET_DISCONNECT
*/
/* If defined, the incoming SYN packet (connection request) is checked for a minimum acceptable
MSS for the host to accept the connection. The default minimum should be based on the host
application packet pool payload, socket transmit queue depth and relevant application specific parameters. */
/*
#define NX_ENABLE_TCP_MSS_CHECK
#define NX_TCP_MSS_MINIMUM 128
*/
/* If defined, NetX Duo has a notify callback for the transmit TCP socket queue decreased from
the maximum queue depth. */
/*
#define NX_ENABLE_TCP_QUEUE_DEPTH_UPDATE_NOTIFY
*/
/* Defined, feature of low watermark is enabled. */
/*
#define NX_ENABLE_LOW_WATERMARK
*/
/* Define the maximum receive queue for TCP socket. */
/*
#ifdef NX_ENABLE_LOW_WATERMARK
#define NX_TCP_MAXIMUM_RX_QUEUE 20
#endif
*/
/* Configuration options for fragmentation */
/* Defined, this option disables both IPv4 and IPv6 fragmentation and reassembly logic. */
/*
#define NX_DISABLE_FRAGMENTATION
*/
/* Defined, this option process IP fragmentation immediately. */
/*
#define NX_FRAGMENT_IMMEDIATE_ASSEMBLY
*/
/* This define specifies the maximum time of IP reassembly. The default value is 60.
By default this option is not defined. */
/*
#define NX_IP_MAX_REASSEMBLY_TIME 60
*/
/* This define specifies the maximum time of IPv4 reassembly. The default value is 15.
Note that if NX_IP_MAX_REASSEMBLY_TIME is defined, this option is automatically defined as 60.
By default this option is not defined. */
/*
#define NX_IPV4_MAX_REASSEMBLY_TIME 15
*/
/* This define specifies the maximum time of IPv6 reassembly. The default value is 60.
Note that if NX_IP_MAX_REASSEMBLY_TIME is defined, this option is automatically defined as 60.
By default this option is not defined. */
/*
#define NX_IPV6_MAX_REASSEMBLY_TIME 60
*/
/* Configuration options for checksum */
/* Defined, this option disables checksum logic on received ICMPv4 packets.
Note that if NX_DISABLE_ICMP_RX_CHECKSUM is defined, this option is
automatically defined. By default this option is not defined.*/
/*
#define NX_DISABLE_ICMPV4_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on received ICMPv6 packets.
Note that if NX_DISABLE_ICMP_RX_CHECKSUM is defined, this option is
automatically defined. By default this option is not defined.*/
/*
#define NX_DISABLE_ICMPV6_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on received ICMPv4 or ICMPv6 packets.
Note that if NX_DISABLE_ICMP_RX_CHECKSUM is defined, NX_DISABLE_ICMPV4_RX_CHECKSUM
and NX_DISABLE_ICMPV6_RX_CHECKSUM are automatically defined. */
/*
#define NX_DISABLE_ICMP_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted ICMPv4 packets.
Note that if NX_DISABLE_ICMP_TX_CHECKSUM is defined, this option is
automatically defined. By default this option is not defined.*/
/*
#define NX_DISABLE_ICMPV4_TX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted ICMPv6 packets.
Note that if NX_DISABLE_ICMP_TX_CHECKSUM is defined, this option is
automatically defined. By default this option is not defined.*/
/*
#define NX_DISABLE_ICMPV6_TX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted ICMPv4 or ICMPv6 packets.
Note that if NX_DISABLE_ICMP_TX_CHECKSUM is defined, NX_DISABLE_ICMPV4_TX_CHECKSUM
and NX_DISABLE_ICMPV6_TX_CHECKSUM are automatically defined. */
/*
#define NX_DISABLE_ICMP_TX_CHECKSUM
*/
/* Defined, this option disables checksum logic on received IP packets. This is useful if the link-layer
has reliable checksum or CRC logic. */
/*
#define NX_DISABLE_IP_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted IP packets. */
/*
#define NX_DISABLE_IP_TX_CHECKSUM
*/
/* Defined, this option disables checksum logic on received TCP packets. */
/*
#define NX_DISABLE_TCP_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted TCP packets. */
/*
#define NX_DISABLE_TCP_TX_CHECKSUM
*/
/* Defined, this option disables checksum logic on received UDP packets. */
/*
#define NX_DISABLE_UDP_RX_CHECKSUM
*/
/* Defined, this option disables checksum logic on transmitted UDP packets. Note that
IPV6 requires the UDP checksum computed for outgoing packets. If this option is
defined, the IPv6 NetX Duo host must ensure the UDP checksum is computed elsewhere
before the packet is transmitted. */
/*
#define NX_DISABLE_UDP_TX_CHECKSUM
*/
/* Configuration options for statistics. */
/* Defined, ARP information gathering is disabled. */
/*
#define NX_DISABLE_ARP_INFO
*/
/* Defined, IP information gathering is disabled. */
/*
#define NX_DISABLE_IP_INFO
*/
/* Defined, ICMP information gathering is disabled. */
/*
#define NX_DISABLE_ICMP_INFO
*/
/* Defined, IGMP information gathering is disabled. */
/*
#define NX_DISABLE_IGMP_INFO
*/
/* Defined, packet information gathering is disabled. */
/*
#define NX_DISABLE_PACKET_INFO
*/
/* Defined, RARP information gathering is disabled. */
/*
#define NX_DISABLE_RARP_INFO
*/
/* Defined, TCP information gathering is disabled. */
/*
#define NX_DISABLE_TCP_INFO
*/
/* Defined, UDP information gathering is disabled. */
/*
#define NX_DISABLE_UDP_INFO
*/
/* Configuration options for Packet Pool */
/* This define specifies the size of the physical packet header. The default value is 16 (based on
a typical 16-byte Ethernet header). */
/*
#define NX_PHYSICAL_HEADER 16
*/
/* This define specifies the size of the physical packet trailer and is typically used to reserve storage
for things like Ethernet CRCs, etc. */
/*
#define NX_PHYSICAL_TRAILER 4
*/
/* Defined, this option disables the addition size checking on received packets. */
/*
#define NX_DISABLE_RX_SIZE_CHECKING
*/
/* Defined, packet debug infromation is enabled. */
/*
#define NX_ENABLE_PACKET_DEBUG_INFO
*/
/* Defined, NX_PACKET structure is padded for alignment purpose. The default is no padding. */
/*
#define NX_PACKET_HEADER_PAD
#define NX_PACKET_HEADER_PAD_SIZE 1
*/
/* Defined, packet header and payload are aligned automatically by the value. The default value is sizeof(ULONG). */
/*
#define NX_PACKET_ALIGNMENT sizeof(ULONG)
*/
/* If defined, the packet chain feature is removed. */
/*
#define NX_DISABLE_PACKET_CHAIN
*/
/* Defined, the IP instance manages two packet pools. */
/*
#define NX_ENABLE_DUAL_PACKET_POOL
*/
/* Configuration options for Others */
/* Defined, this option bypasses the basic NetX error checking. This define is typically used
after the application is fully debugged. */
/*
#define NX_DISABLE_ERROR_CHECKING
*/
/* Defined, this option enables deferred driver packet handling. This allows the driver to place a raw
packet on the IP instance and have the driver's real processing routine called from the NetX internal
IP helper thread. */
/*
#define NX_DRIVER_DEFERRED_PROCESSING
*/
/* Defined, the source address of incoming packet is checked. The default is disabled. */
/*
#define NX_ENABLE_SOURCE_ADDRESS_CHECK
*/
/* Defined, the extended notify support is enabled. This feature adds additional callback/notify services
to NetX Duo API for notifying the application of socket events, such as TCP connection and disconnect
completion. These extended notify functions are mainly used by the BSD wrapper. The default is this
feature is disabled. */
/*
#define NX_ENABLE_EXTENDED_NOTIFY_SUPPORT
*/
/* Defined, ASSERT is disabled. The default is enabled. */
/*
#define NX_DISABLE_ASSERT
*/
/* Define the process when assert fails. */
/*
#define NX_ASSERT_FAIL while (1) tx_thread_sleep(NX_WAIT_FOREVER);
*/
/* Defined, the IPv4 feature is disabled. */
/*
#define NX_DISABLE_IPV4
*/
/* Defined, the destination address of ICMP packet is checked. The default is disabled.
An ICMP Echo Request destined to an IP broadcast or IP multicast address will be silently discarded.
*/
/*
#define NX_ENABLE_ICMP_ADDRESS_CHECK
*/
/* Define the max string length. The default value is 1024. */
/*
#define NX_MAX_STRING_LENGTH 1024
*/
/* Defined, the TCP/IP offload feature is enabled.
NX_ENABLE_INTERFACE_CAPABILITY must be defined to enable this feature. */
/*
#define NX_ENABLE_TCPIP_OFFLOAD
*/
/* Defined, the VLAN feature is enabled.
Note: Require driver support to use APIs from this file.
A quick check in driver is to search for
NX_LINK_RAW_PACKET_SEND. VLAN APIs are not supported if not found. */
/*
#define NX_ENABLE_VLAN
*/
#ifdef __cplusplus
extern "C" {
#endif
int rand(void);
void srand(unsigned seed);
#ifdef __cplusplus
}
#endif
#define NX_RAND rand
#define NX_SRAND srand
#endif
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