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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_tcp.h"
#include "nx_arp.h"
#include "nx_igmp.h"
#include "nx_ip.h"
#include "nx_packet.h"
#ifdef FEATURE_NX_IPV6
#include "nx_icmpv6.h"
#endif /* FEATURE_NX_IPV6 */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ip_interface_detach PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function detaches a physical network interface from the IP */
/* instance. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* index IP interface index */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* _nx_tcp_socket_connection_reset Reset TCP connection */
/* _nx_arp_interface_entries_delete Remove specified ARP entries */
/* _nx_invalidate_destination_entry Invalidate the entry in the */
/* destination */
/* _nx_nd_cache_interface_entries_delete Delete ND cache entries */
/* associated with specific */
/* interface */
/* link_driver_entry Link driver */
/* memset Zero out the interface */
/* */
/* 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_interface_detach(NX_IP *ip_ptr, UINT index)
{
NX_INTERFACE *interface_ptr;
NX_IP_DRIVER driver_request;
NX_TCP_SOCKET *socket_ptr;
NXD_IPV6_ADDRESS *next_ipv6_address;
NXD_IPV6_ADDRESS *ipv6_address;
UINT i;
#ifdef NX_ENABLE_IP_STATIC_ROUTING
UINT j;
#endif
#ifdef FEATURE_NX_IPV6
NX_IPV6_DEFAULT_ROUTER_ENTRY *rt_entry;
#endif
interface_ptr = &(ip_ptr -> nx_ip_interface[index]);
/* Check interface status. */
if (interface_ptr -> nx_interface_valid == NX_FALSE)
{
/* Invalid interface. */
return(NX_INVALID_INTERFACE);
}
/* Obtain the IP internal mutex before calling the driver. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Loop through the list of created TCP sockets for this IP instance. */
socket_ptr = ip_ptr -> nx_ip_tcp_created_sockets_ptr;
if (socket_ptr != NX_NULL)
{
do
{
/* Reset TCP connection which is established or in progress on this interface. */
if (socket_ptr -> nx_tcp_socket_connect_interface == interface_ptr)
{
_nx_tcp_socket_connection_reset(socket_ptr);
}
/* Move to the next. */
socket_ptr = socket_ptr -> nx_tcp_socket_created_next;
} while (socket_ptr != ip_ptr -> nx_ip_tcp_created_sockets_ptr);
}
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
#ifndef NX_DISABLE_IPV4
/* Remove ARP entries associated with this interface from ARP table. */
_nx_arp_interface_entries_delete(ip_ptr, index);
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
/* Delete ND cache entries associated with this interface. */
_nx_nd_cache_interface_entries_delete(ip_ptr, index);
#endif /* FEATURE_NX_IPV6 */
/* Obtain the IP internal mutex before calling the driver. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
#ifndef NX_DISABLE_IPV4
#ifdef NX_ENABLE_IP_STATIC_ROUTING
/* Remove router iterms associated with the interface that will be detached from route table. */
for (i = 0; i < ip_ptr -> nx_ip_routing_table_entry_count; i++)
{
/* Is this router iterm related to the interface to be detached. */
if (ip_ptr -> nx_ip_routing_table[i].nx_ip_routing_entry_ip_interface == interface_ptr)
{
/* Yes, we need to remove this iterm. */
/* If the entry is not the last one, we need to shift the table to fill the hole. */
for (j = i; j < ip_ptr -> nx_ip_routing_table_entry_count; j++)
{
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_dest_ip =
ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_dest_ip;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_net_mask =
ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_net_mask;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_next_hop_address =
ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_next_hop_address;
ip_ptr -> nx_ip_routing_table[j].nx_ip_routing_entry_ip_interface =
ip_ptr -> nx_ip_routing_table[j + 1].nx_ip_routing_entry_ip_interface;
}
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_dest_ip = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_net_mask = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_next_hop_address = 0;
ip_ptr -> nx_ip_routing_table[j - 1].nx_ip_routing_entry_ip_interface = NX_NULL;
ip_ptr -> nx_ip_routing_table_entry_count--;
}
}
#endif /* NX_ENABLE_IP_STATIC_ROUTING */
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
/* Remove IPv6 routers associated with this interface. */
for (i = 0; i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE; i++)
{
/* Set local pointer for convenience. */
rt_entry = &ip_ptr -> nx_ipv6_default_router_table[i];
/* Does this slot contain a router. */
if (rt_entry -> nx_ipv6_default_router_entry_flag & NX_IPV6_ROUTE_TYPE_VALID)
{
/* Is this router iterm related to the interface to be detached. */
if (rt_entry -> nx_ipv6_default_router_entry_interface_ptr == interface_ptr)
{
/* Yes, we need to remove this router iterm. */
/* Clean any entries in the destination table for this router. */
_nx_invalidate_destination_entry(ip_ptr, rt_entry -> nx_ipv6_default_router_entry_router_address);
/* Mark the entry as empty. */
rt_entry -> nx_ipv6_default_router_entry_flag = 0;
/* Clear the interface pointer .*/
rt_entry -> nx_ipv6_default_router_entry_interface_ptr = NX_NULL;
/* Decrease the count of available routers. */
ip_ptr -> nx_ipv6_default_router_table_size--;
}
}
}
#endif
#ifndef NX_DISABLE_IPV4
/* Clear gateway address related to the interface to be detached. */
if (ip_ptr -> nx_ip_gateway_interface == interface_ptr)
{
ip_ptr -> nx_ip_gateway_interface = NX_NULL;
ip_ptr -> nx_ip_gateway_address = 0;
}
/* Leave multicast groups related to the interface to be detached. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Skip entries not related to the interface. */
if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list != interface_ptr)
{
continue;
}
/* Set join count to 1 so force send multicast leave command. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_count = 1;
/* Leave the multicast group. */
_nx_igmp_multicast_interface_leave_internal(ip_ptr,
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list,
index);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef NX_ENABLE_IPV6_MULTICAST
/* Leave IPv6 multicast groups related to the interface to be detached. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
if (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list == interface_ptr)
{
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_count = 0;
/* Clear the group join value. */
memset(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list, 0, 4 * sizeof(ULONG));
/* Decrement the MLD groups joined count. */
ip_ptr -> nx_ipv6_multicast_groups_joined--;
/* Un-register the new multicast group with the underlying driver. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_MULTICAST_LEAVE;
driver_request.nx_ip_driver_physical_address_msw = 0x00003333;
driver_request.nx_ip_driver_physical_address_lsw =
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list[3];
driver_request.nx_ip_driver_interface = interface_ptr;
(interface_ptr -> nx_interface_link_driver_entry)(&driver_request);
/* Now clear the interface entry. */
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list = NX_NULL;
}
}
#endif
/* Detach the interface. */
/* First detach the interface from the device. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_INTERFACE_DETACH;
driver_request.nx_ip_driver_interface = interface_ptr;
(interface_ptr -> nx_interface_link_driver_entry)(&driver_request);
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Clear out IPv6 address. */
next_ipv6_address = interface_ptr -> nxd_interface_ipv6_address_list_head;
while (next_ipv6_address)
{
ipv6_address = next_ipv6_address;
next_ipv6_address = next_ipv6_address -> nxd_ipv6_address_next;
memset(ipv6_address, 0, sizeof(NXD_IPV6_ADDRESS));
}
/* Zero out the interface. */
memset(interface_ptr, 0, sizeof(NX_INTERFACE));
/* reserve the index. */
interface_ptr -> nx_interface_index = (UCHAR)index;
return(NX_SUCCESS);
}
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