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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Internet Protocol (IP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_packet.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ip_fragment_disable PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function disables IP fragment assembly processing and releases */
/* all partial fragments being assembled. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_release Release packet */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _nx_ip_fragment_disable(NX_IP *ip_ptr)
{
#ifndef NX_DISABLE_FRAGMENTATION
TX_INTERRUPT_SAVE_AREA
#ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
NX_PACKET *new_fragment_head;
#endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
NX_PACKET *assemble_head;
NX_PACKET *next_packet;
NX_PACKET *release_packet;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_IP_FRAGMENT_DISABLE, ip_ptr, 0, 0, 0, NX_TRACE_IP_EVENTS, 0, 0);
/* Get mutex protection. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Disable interrupts temporarily. */
TX_DISABLE
/* Clear the IP fragment processing routine pointer. */
ip_ptr -> nx_ip_fragment_processing = NX_NULL;
/* Clear the IP fragment assembly routine pointer. */
ip_ptr -> nx_ip_fragment_assembly = NX_NULL;
/* Clear the IP fragment timeout routine pointer. */
ip_ptr -> nx_ip_fragment_timeout_check = NX_NULL;
/* Pickup the fragment list pointer. */
#ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
new_fragment_head = ip_ptr -> nx_ip_received_fragment_head;
#else
NX_ASSERT(ip_ptr -> nx_ip_received_fragment_head == NX_NULL);
#endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
assemble_head = ip_ptr -> nx_ip_fragment_assembly_head;
/* Clear the IP structure lists. */
ip_ptr -> nx_ip_received_fragment_head = NX_NULL;
ip_ptr -> nx_ip_received_fragment_tail = NX_NULL;
ip_ptr -> nx_ip_fragment_assembly_head = NX_NULL;
ip_ptr -> nx_ip_fragment_assembly_tail = NX_NULL;
/* Restore interrupts. */
TX_RESTORE
/* Release mutex protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
#ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
/* Now walk through the receive and assembly lists to free the packets. */
next_packet = new_fragment_head;
while (next_packet)
{
/* Set the release packet to this packet. */
release_packet = next_packet;
/* Move next packet to the next in the list. */
next_packet = next_packet -> nx_packet_queue_next;
/* Release the current packet. */
_nx_packet_release(release_packet);
}
#endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
/* Now walk through the assemble list and release all packets. */
while (assemble_head)
{
/* Walk through the list of packets being assembled for this packet and release them. */
next_packet = assemble_head;
assemble_head = next_packet -> nx_packet_queue_next;
while (next_packet)
{
/* Set the release packet to this packet. */
release_packet = next_packet;
/* Move next packet to the next in the list. */
next_packet = next_packet -> nx_packet_union_next.nx_packet_fragment_next;
/* Reset tcp_queue_next before releasing. */
/*lint -e{923} suppress cast of ULONG to pointer. */
release_packet -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ALLOCATED;
/* Release the current packet. */
_nx_packet_release(release_packet);
}
}
/* Return success to the caller. */
return(NX_SUCCESS);
#else /* NX_DISABLE_FRAGMENTATION */
NX_PARAMETER_NOT_USED(ip_ptr);
return(NX_NOT_ENABLED);
#endif /* NX_DISABLE_FRAGMENTATION */
}