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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 */
/** */
/** Address Resolution Protocol (ARP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_arp.h"
#include "nx_packet.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_packet_receive PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes the reception of both the ARP request and */
/* the ARP response. ARP requests are filled in and sent out as ARP */
/* responses. ARP responses received are used to update this IP's */
/* ARP cache and dequeue and send any waiting packet. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* packet_ptr Received ARP packet */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_packet_release Release the ARP request */
/* (nx_ip_arp_allocate) ARP entry allocate call */
/* (nx_ip_arp_gratuitous_response_handler) ARP gratuitous response */
/* _nx_arp_queue_send Send the queued packet */
/* */
/* CALLED BY */
/* */
/* _nx_arp_queue_process ARP receive queue processing */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _nx_arp_packet_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
ULONG *message_ptr;
ULONG sender_physical_msw;
ULONG sender_physical_lsw;
ULONG sender_ip_address;
ULONG target_ip_address;
ULONG message_type;
ULONG index;
UCHAR consumed = NX_FALSE;
NX_ARP *arp_ptr;
NX_IP_DRIVER driver_request;
NX_INTERFACE *interface_ptr;
#ifndef NX_DISABLE_RX_SIZE_CHECKING
/* Determine if the packet length is valid. */
if (packet_ptr -> nx_packet_length < NX_ARP_MESSAGE_SIZE)
{
/* Invalid ARP message. Release the packet and return. */
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP invalid messages count. */
ip_ptr -> nx_ip_arp_invalid_messages++;
#endif
/* Invalid ARP message. Just release the packet. */
_nx_packet_release(packet_ptr);
/* Return to caller. */
return;
}
#endif /* NX_DISABLE_RX_SIZE_CHECKING */
/* Setup a pointer to the ARP message. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
message_ptr = (ULONG *)packet_ptr -> nx_packet_prepend_ptr;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the ARP message. */
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 1));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 2));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 3));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 4));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 5));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 6));
/* Pickup the ARP message type. */
message_type = (ULONG)(*(message_ptr + 1) & 0xFFFF);
/* Determine if the ARP message type is valid. */
if ((message_type != NX_ARP_OPTION_REQUEST) && (message_type != NX_ARP_OPTION_RESPONSE))
{
/* Invalid ARP message. Release the packet and return. */
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP invalid messages count. */
ip_ptr -> nx_ip_arp_invalid_messages++;
#endif
/* Invalid ARP message. Just release the packet. */
_nx_packet_release(packet_ptr);
/* Return to caller. */
return;
}
/* Pick up the sender's physical address from the message. */
sender_physical_msw = (*(message_ptr + 2) >> 16);
sender_physical_lsw = (*(message_ptr + 2) << 16) | (*(message_ptr + 3) >> 16);
sender_ip_address = (*(message_ptr + 3) << 16) | (*(message_ptr + 4) >> 16);
target_ip_address = *(message_ptr + 6);
/* Does the packet have an interface assigned? */
if (packet_ptr -> nx_packet_address.nx_packet_interface_ptr == NX_NULL)
{
/* No, so default it to the primary interface. */
packet_ptr -> nx_packet_address.nx_packet_interface_ptr = &ip_ptr -> nx_ip_interface[0];
}
/* Pickup the interface information from the incoming packet. */
interface_ptr = packet_ptr -> nx_packet_address.nx_packet_interface_ptr;
/* Determine if it is an IP address conflict when IP address probing. */
if ((interface_ptr -> nx_interface_ip_address == 0) &&
(interface_ptr -> nx_interface_ip_probe_address != 0) &&
((sender_ip_address == interface_ptr -> nx_interface_ip_probe_address) ||
((sender_ip_address == 0) && (target_ip_address == interface_ptr -> nx_interface_ip_probe_address))))
{
/* Make sure the sender physical address is not ours. */
if ((sender_physical_msw != interface_ptr -> nx_interface_physical_address_msw) ||
(sender_physical_lsw != interface_ptr -> nx_interface_physical_address_lsw))
{
/* Determine if there is a a IP address conflict notify handler. */
if (interface_ptr -> nx_interface_ip_conflict_notify_handler)
{
/* A IP address conflict is present, call the notification handler. */
(interface_ptr -> nx_interface_ip_conflict_notify_handler)(ip_ptr, interface_ptr -> nx_interface_index, interface_ptr -> nx_interface_ip_probe_address,
sender_physical_msw, sender_physical_lsw);
}
}
/* Release the packet. */
_nx_packet_release(packet_ptr);
return;
}
/* Determine if it is an address conflict packet after set the IP address. */
if ((sender_ip_address != 0) && (sender_ip_address == interface_ptr -> nx_interface_ip_address))
{
/* Is it sent from other devices. */
if ((sender_physical_msw != packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_msw) ||
(sender_physical_lsw != packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw))
{
/* Yes it is. */
if (packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_arp_defend_timeout == 0)
{
/* Set defend timeout. */
packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_arp_defend_timeout = NX_ARP_DEFEND_INTERVAL;
/* Send the announcement. */
_nx_arp_packet_send(ip_ptr, sender_ip_address, packet_ptr -> nx_packet_address.nx_packet_interface_ptr);
}
/* Determine if there is a a IP address conflict notify handler. */
if (interface_ptr -> nx_interface_ip_conflict_notify_handler)
{
/* A IP address conflict is present, call the notification handler. */
(interface_ptr -> nx_interface_ip_conflict_notify_handler)(ip_ptr, interface_ptr -> nx_interface_index, interface_ptr -> nx_interface_ip_probe_address,
sender_physical_msw, sender_physical_lsw);
}
/* This is likely in response to our previous gratuitous ARP from another entity on the
network has the same IP address. */
/* Determine if there is a gratuitous ARP response handler. */
if (ip_ptr -> nx_ip_arp_gratuitous_response_handler)
{
/* Yes, call the gratuitous ARP response handler. Note that it is responsible
for releasing the packet! */
(ip_ptr -> nx_ip_arp_gratuitous_response_handler)(ip_ptr, packet_ptr);
return;
}
#ifdef NX_ARP_DEFEND_BY_REPLY
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP responses sent count. */
ip_ptr -> nx_ip_arp_responses_sent++;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_RESPONSE_SEND, ip_ptr, sender_ip, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Set the ARP message type to ARP response. */
* (message_ptr + 1) = (*(message_ptr + 1) & 0xFFFF0000) | NX_ARP_OPTION_RESPONSE;
/* Now fill in the new source and destination information for the ARP response. */
*(message_ptr + 2) = (ULONG)(packet_ptr -> nx_packet_ip_interface -> nx_interface_physical_address_msw << 16) |
(packet_ptr -> nx_packet_ip_interface -> nx_interface_physical_address_lsw >> 16);
*(message_ptr + 3) = (ULONG)(packet_ptr -> nx_packet_ip_interface -> nx_interface_physical_address_lsw << 16) |
(packet_ptr -> nx_packet_ip_interface -> nx_interface_ip_address >> 16);
*(message_ptr + 4) = (ULONG)(packet_ptr -> nx_packet_ip_interface -> nx_interface_ip_address << 16);
*(message_ptr + 5) = (ULONG)0;
*(message_ptr + 6) = (ULONG)0;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the ARP message. */
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 1));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 2));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 3));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 4));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 5));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 6));
/* Make sure the packet length is set properly. */
packet_ptr -> nx_packet_length = NX_ARP_MESSAGE_SIZE;
/* Setup the append pointer, since the received ARP packet can be padded
with unnecessary bytes. */
packet_ptr -> nx_packet_append_ptr = packet_ptr -> nx_packet_prepend_ptr + NX_ARP_MESSAGE_SIZE;
/* Send the ARP request to the driver. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_ARP_RESPONSE_SEND;
driver_request.nx_ip_driver_packet = packet_ptr;
driver_request.nx_ip_driver_physical_address_msw = 0xFFFFUL;
driver_request.nx_ip_driver_physical_address_lsw = 0xFFFFFFFFUL;
driver_request.nx_ip_driver_interface = packet_ptr -> nx_packet_ip_interface;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_ARP_RESPONSE_SEND, ip_ptr, packet_ptr, packet_ptr -> nx_packet_length, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0)
/* No need to update packet_ptr -> nx_packet_ip_interface. When responding to an ARP request, use the same interface where the request was received. */
(packet_ptr -> nx_packet_ip_interface -> nx_interface_link_driver_entry)(&driver_request);
return;
#endif /* NX_ARP_DEFEND_BY_REPLY */
}
/* Release the conflict packet. */
_nx_packet_release(packet_ptr);
return;
}
/* Determine what type of ARP message this is. Note that ARP requests must
also specify this IP instance's IP address. */
if ((message_type == NX_ARP_OPTION_REQUEST) && (target_ip_address == (packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_ip_address)))
{
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP requests received count. */
ip_ptr -> nx_ip_arp_requests_received++;
/* Increment the ARP responses sent count. */
ip_ptr -> nx_ip_arp_responses_sent++;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_REQUEST_RECEIVE, ip_ptr, sender_ip_address, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_RESPONSE_SEND, ip_ptr, sender_ip_address, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Set the ARP message type to ARP response. */
*(message_ptr + 1) = (*(message_ptr + 1) & 0xFFFF0000) | NX_ARP_OPTION_RESPONSE;
/* Now fill in the new source and destination information for the ARP response. */
*(message_ptr + 2) = (ULONG)(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_msw << 16) |
(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw >> 16);
*(message_ptr + 3) = (ULONG)(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw << 16) |
(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_ip_address >> 16);
*(message_ptr + 4) = (ULONG)(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_ip_address << 16) | sender_physical_msw;
*(message_ptr + 5) = (ULONG)sender_physical_lsw;
*(message_ptr + 6) = (ULONG)sender_ip_address;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the ARP message. */
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 1));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 2));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 3));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 4));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 5));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 6));
/* Make sure the packet length is set properly. */
packet_ptr -> nx_packet_length = NX_ARP_MESSAGE_SIZE;
/* Setup the append pointer, since the received ARP packet can be padded
with unnecessary bytes. */
packet_ptr -> nx_packet_append_ptr = packet_ptr -> nx_packet_prepend_ptr + NX_ARP_MESSAGE_SIZE;
/* Send the ARP request to the driver. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_ARP_RESPONSE_SEND;
driver_request.nx_ip_driver_packet = packet_ptr;
driver_request.nx_ip_driver_physical_address_msw = sender_physical_msw;
driver_request.nx_ip_driver_physical_address_lsw = sender_physical_lsw;
driver_request.nx_ip_driver_interface = packet_ptr -> nx_packet_address.nx_packet_interface_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_ARP_RESPONSE_SEND, ip_ptr, packet_ptr, packet_ptr -> nx_packet_length, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* No need to update interface. When responding to an ARP request, use the same interface where the request was received. */
(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_link_driver_entry)(&driver_request);
/* Set the consumed as NX_TRUE, do not need to release the packet. */
consumed = NX_TRUE;
}
else
{
/* We have a response to a previous ARP request or Gratuitous ARP from another network entity. */
#ifndef NX_DISABLE_ARP_INFO
/* Check for the message type to see which counter to increment. */
if (message_type == NX_ARP_OPTION_REQUEST)
{
/* Increment the ARP requests received count. */
ip_ptr -> nx_ip_arp_requests_received++;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_REQUEST_RECEIVE, ip_ptr, sender_ip_address, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
}
else
{
/* Increment the ARP responses received count. */
ip_ptr -> nx_ip_arp_responses_received++;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_RESPONSE_RECEIVE, ip_ptr, sender_ip_address, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
}
#endif /* NX_DISABLE_ARP_INFO */
}
/* In either case, search the ARP cache to update any entry that matches the sender's IP
address. */
/* Now we need to search through the active ARP list for the IP address
to see if there is a matching entry. */
/* Calculate the hash index for the sender IP address. */
index = (UINT)((sender_ip_address + (sender_ip_address >> 8)) & NX_ARP_TABLE_MASK);
/* Pickup the first ARP entry. */
arp_ptr = NX_NULL;
/* Ignore anything from any ARP packet with a zero sender IP address. */
if (sender_ip_address != 0)
{
/* Calculate the hash index for the sender IP address. */
index = (UINT)((sender_ip_address + (sender_ip_address >> 8)) & NX_ROUTE_TABLE_MASK);
/* Pickup the first ARP entry. */
arp_ptr = ip_ptr -> nx_ip_arp_table[index];
}
/* Loop to look for an ARP match. */
while (arp_ptr)
{
/* Check for an IP match. */
if (arp_ptr -> nx_arp_ip_address == sender_ip_address)
{
#ifdef NX_ENABLE_ARP_MAC_CHANGE_NOTIFICATION
/* Determine if there is a ARP collision notify handler. */
if (ip_ptr -> nx_ip_arp_collision_notify_response_handler)
{
/* Now check if the machine address is stored in our ARP cache. */
if ((arp_ptr -> nx_arp_physical_address_msw != 0) || (arp_ptr -> nx_arp_physical_address_lsw != 0))
{
/* Now check if its machine address is different from what is in our ARP cache. */
if ((arp_ptr -> nx_arp_physical_address_msw != sender_physical_msw) ||
(arp_ptr -> nx_arp_physical_address_lsw != sender_physical_lsw))
{
/* A collision is present with the mapping in our ARP table. Call the notification handler.
Note: the application must release the packet. */
(ip_ptr -> nx_ip_arp_collision_notify_response_handler)((void *)packet_ptr);
/* We're done. NetX does not respond or do any further processing.*/
return;
}
}
}
#endif /* NX_ENABLE_ARP_MAC_CHANGE_NOTIFICATION */
/* No need to update the static ARP entry. */
if (arp_ptr -> nx_arp_route_static)
{
break;
}
/* Save the physical address found in this ARP response. */
arp_ptr -> nx_arp_physical_address_msw = sender_physical_msw;
arp_ptr -> nx_arp_physical_address_lsw = sender_physical_lsw;
/* Set the update rate to the expiration rate since we now have an ARP
response. */
arp_ptr -> nx_arp_entry_next_update = NX_ARP_EXPIRATION_RATE;
/* Reset the retry counter for this ARP entry. */
arp_ptr -> nx_arp_retries = 0;
/* Set the interface attached to this packet. */
arp_ptr -> nx_arp_ip_interface = interface_ptr;
/* Call queue send function to send the packet queued up. */
_nx_arp_queue_send(ip_ptr, arp_ptr);
/* Yes, we found a match. Get out of the loop! */
break;
}
/* Move to the next active ARP entry. */
arp_ptr = arp_ptr -> nx_arp_active_next;
/* Determine if we are at the end of the ARP list. */
if (arp_ptr == ip_ptr -> nx_ip_arp_table[index])
{
/* Clear the ARP pointer. */
arp_ptr = NX_NULL;
break;
}
}
/* Determine if we have a packet to release. */
if (consumed == NX_FALSE)
{
_nx_packet_release(packet_ptr);
}
#ifndef NX_DISABLE_ARP_AUTO_ENTRY
/* Determine if anything was found. Ignore ARP messages with a zero IP sender address. */
if ((arp_ptr == NX_NULL) && (sender_ip_address != 0))
{
/* Calculate the hash index for the sender IP address. */
index = (UINT)((sender_ip_address + (sender_ip_address >> 8)) & NX_ARP_TABLE_MASK);
/* Allocate a new ARP entry in advance of the need to send to the IP
address. */
if (((ip_ptr -> nx_ip_arp_allocate)(ip_ptr, &(ip_ptr -> nx_ip_arp_table[index]), NX_FALSE)) == NX_SUCCESS)
{
/* Setup a pointer to the new ARP entry. */
arp_ptr = (ip_ptr -> nx_ip_arp_table[index]) -> nx_arp_active_previous;
/* Setup the IP address and clear the physical mapping. */
arp_ptr -> nx_arp_ip_address = sender_ip_address;
arp_ptr -> nx_arp_physical_address_msw = sender_physical_msw;
arp_ptr -> nx_arp_physical_address_lsw = sender_physical_lsw;
arp_ptr -> nx_arp_entry_next_update = NX_ARP_EXPIRATION_RATE;
arp_ptr -> nx_arp_retries = 0;
arp_ptr -> nx_arp_ip_interface = interface_ptr;
}
}
#endif /* NX_DISABLE_ARP_AUTO_ENTRY */
}
#endif /* !NX_DISABLE_IPV4 */