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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_ipv6.h"
#include "nx_packet.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ipv6_packet_send PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function prepends an IP header and sends an IP packet to the */
/* appropriate link driver. Caller needs to fill in the correct */
/* source and destination addresses into the packet source and */
/* destination address. Caller also makes sure that the packet */
/* interface address is valid (not in tentative state), and source */
/* address is not unspecified e.g. NULL. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to send */
/* protocol Protocol being encapsulated */
/* payload_size Size of the payload */
/* hop_limit Hop limit value to set in IP */
/* header. */
/* src_address Source address */
/* dest_address Destination address */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_ipv6_header_add Add IPv6 header */
/* _nx_packet_transmit_release Release transmit packet */
/* _nx_nd_cache_add_entry Add new entry to ND Cache */
/* IPv6_Address_Type Find IPv6 address type */
/* _nx_packet_copy Packet copy */
/* _nx_ip_packet_deferred_receive Places received packets in */
/* deferred packet queue */
/* _nx_icmpv6_send_ns Send neighbor solicitation */
/* _nxd_ipv6_search_onlink Find onlink match */
/* _nx_ipv6_fragment_processing Fragment processing */
/* (ip_link_driver) User supplied link driver */
/* */
/* CALLED BY */
/* */
/* NetX Source Code */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _nx_ipv6_packet_send(NX_IP *ip_ptr, NX_PACKET *packet_ptr,
ULONG protocol, ULONG payload_size, ULONG hop_limit,
ULONG *src_address, ULONG *dest_address)
{
UINT status = NX_SUCCESS;
ULONG address_type;
UINT next_hop_mtu;
ULONG fragment = NX_TRUE;
#ifdef NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
NX_IPV6_DESTINATION_ENTRY *next_hop_dest_entry_ptr;
#endif /* NX_ENABLE_IPV6_PATH_MTU_DISCOVERY */
NX_IP_DRIVER driver_request;
NX_PACKET *remove_packet;
NX_PACKET *packet_copy;
UINT same_address;
NX_INTERFACE *if_ptr;
NX_IPV6_DESTINATION_ENTRY *dest_entry_ptr;
/*lint -e{644} suppress variable might not be initialized, since "packet_ptr" was initialized. */
if_ptr = packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address_attached;
/* Interface can not be NULL. */
NX_ASSERT(if_ptr != NX_NULL);
#ifdef NX_ENABLE_TCPIP_OFFLOAD
if (if_ptr -> nx_interface_capability_flag & NX_INTERFACE_CAPABILITY_TCPIP_OFFLOAD)
{
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP invalid packet error. */
ip_ptr -> nx_ip_invalid_transmit_packets++;
#endif
/* Ignore sending all packets for TCP/IP offload. Release the packet. */
_nx_packet_transmit_release(packet_ptr);
/* Return... nothing more can be done! */
return;
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
/* Add IPv6 header. */
if (_nx_ipv6_header_add(ip_ptr, &packet_ptr, protocol, payload_size,
hop_limit, src_address, dest_address, &fragment) != NX_SUCCESS)
{
/* Failed to add header. */
return;
}
#ifdef NX_ENABLE_IP_PACKET_FILTER
/* Check if the IP packet filter is set. */
if (ip_ptr -> nx_ip_packet_filter)
{
/* Yes, call the IP packet filter routine. */
if (ip_ptr -> nx_ip_packet_filter((VOID *)(packet_ptr -> nx_packet_prepend_ptr),
NX_IP_PACKET_OUT) != NX_SUCCESS)
{
/* Drop the packet. */
_nx_packet_transmit_release(packet_ptr);
return;
}
}
/* Check if the IP packet filter extended is set. */
if (ip_ptr -> nx_ip_packet_filter_extended)
{
/* Yes, call the IP packet filter extended routine. */
if (ip_ptr -> nx_ip_packet_filter_extended(ip_ptr, packet_ptr, NX_IP_PACKET_OUT) != NX_SUCCESS)
{
/* Drop the packet. */
_nx_packet_transmit_release(packet_ptr);
return;
}
}
#endif /* NX_ENABLE_IP_PACKET_FILTER */
next_hop_mtu = if_ptr -> nx_interface_ip_mtu_size;
packet_ptr -> nx_packet_ip_header = packet_ptr -> nx_packet_prepend_ptr;
/* Check if the host is sending itself a packet. */
same_address = (UINT)CHECK_IPV6_ADDRESSES_SAME(dest_address, src_address);
/* If it is, consider this a loopback address. */
if (same_address == 1)
{
address_type = IPV6_ADDRESS_LOOPBACK;
}
else
{
/* Otherwise check if this packet sending to a known loopback address. */
address_type = IPv6_Address_Type(dest_address);
}
/* Handle the internal loopback case. */
if (address_type == IPV6_ADDRESS_LOOPBACK)
{
if (_nx_packet_copy(packet_ptr, &packet_copy, ip_ptr -> nx_ip_default_packet_pool, NX_NO_WAIT) == NX_SUCCESS)
{
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
/* Compute checksum for upper layer protocol. */
/*lint -e{644} suppress variable might not be initialized, since "packet_copy" was initialized as long as return value is NX_SUCCESS. */
if (packet_copy -> nx_packet_interface_capability_flag)
{
_nx_ip_packet_checksum_compute(packet_copy);
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
/* Get the interface of copied packet. */
/*lint --e{644} suppress variable might not be initialized, since "packet_copy" was initialized as long as return value is NX_SUCCESS. */
packet_copy -> nx_packet_address.nx_packet_interface_ptr = packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address_attached;
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP packet sent count. */
ip_ptr -> nx_ip_total_packets_sent++;
/* Increment the IP bytes sent count. */
ip_ptr -> nx_ip_total_bytes_sent += packet_ptr -> nx_packet_length - (ULONG)sizeof(NX_IPV6_HEADER);
#endif
/* Send the packet to this IP's receive processing like it came in from the driver. */
_nx_ip_packet_deferred_receive(ip_ptr, packet_copy);
}
#ifndef NX_DISABLE_IP_INFO
else
{
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
/* Increment the IP transmit resource error count. */
ip_ptr -> nx_ip_transmit_resource_errors++;
}
#endif
/* Release the transmit packet. */
_nx_packet_transmit_release(packet_ptr);
return;
}
/* Initial the driver request. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_PACKET_SEND;
driver_request.nx_ip_driver_packet = packet_ptr;
driver_request.nx_ip_driver_interface = NX_NULL;
/* Determine if physical mapping is needed by this link driver. */
if (if_ptr -> nx_interface_address_mapping_needed)
{
/* Is this packet a multicast ? */
if ((dest_address[0] & (ULONG)0xFF000000) == (ULONG)0xFF000000)
{
/* Set up the driver request. */
driver_request.nx_ip_driver_physical_address_msw = 0x00003333;
driver_request.nx_ip_driver_physical_address_lsw = dest_address[3];
driver_request.nx_ip_driver_interface = if_ptr;
/* It is; is path MTU enabled? */
#ifdef NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
/* It is. We will check the path MTU for the packet destination to
determine if we need to fragment the packet. */
/* Lookup the multicast destination in the destination table. */
status = _nx_icmpv6_dest_table_find(ip_ptr, dest_address, &dest_entry_ptr, 0, 0);
/* Did we find it in the table? */
/*lint -e{644} suppress variable might not be initialized, since "dest_entry_ptr" was initialized as long as status is NX_SUCCESS. */
if (status == NX_SUCCESS)
{
next_hop_mtu = dest_entry_ptr -> nx_ipv6_destination_entry_path_mtu;
}
#endif /* NX_ENABLE_IPV6_PATH_MTU_DISCOVERY */
}
else
{
/* Obtain MAC address */
ND_CACHE_ENTRY *NDCacheEntry = NX_NULL;
ULONG next_hop_address[4];
SET_UNSPECIFIED_ADDRESS(next_hop_address);
/* Lookup the packet destination in the destination table. */
status = _nx_icmpv6_dest_table_find(ip_ptr, dest_address, &dest_entry_ptr, 0, 0);
/* Was a matching entry found? */
if (status != NX_SUCCESS)
{
/* No; If the packet is either onlink or there is no default router,
just copy the packet destination address to the 'next hop' address. */
if (_nxd_ipv6_search_onlink(ip_ptr, dest_address))
{
COPY_IPV6_ADDRESS(dest_address, next_hop_address);
/* Add the next_hop in destination table. */
status = _nx_icmpv6_dest_table_add(ip_ptr, dest_address, &dest_entry_ptr,
next_hop_address, if_ptr -> nx_interface_ip_mtu_size,
NX_WAIT_FOREVER, packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr);
/* Get the NDCacheEntry. */
if (status == NX_SUCCESS)
{
NDCacheEntry = dest_entry_ptr -> nx_ipv6_destination_entry_nd_entry;
}
}
/* Check whether or not we have a default router. */
/* Suppress cast of pointer to pointer, since it is necessary */
else if (_nxd_ipv6_router_lookup(ip_ptr, if_ptr, next_hop_address, /*lint -e{929}*/ (void **)&NDCacheEntry) == NX_SUCCESS)
{
/* Add the next_hop in destination table. */
status = _nx_icmpv6_dest_table_add(ip_ptr, dest_address, &dest_entry_ptr,
next_hop_address, if_ptr -> nx_interface_ip_mtu_size,
NX_WAIT_FOREVER, packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr);
/* If the default router did not has a reachable ND_CACHE_ENTRY. Get the NDCacheEntry. */
/*lint -e{644} suppress variable might not be initialized, since "NDCacheEntry" was initialized in _nxd_ipv6_route_lookup. */
if ((status == NX_SUCCESS) && !NDCacheEntry)
{
NDCacheEntry = dest_entry_ptr -> nx_ipv6_destination_entry_nd_entry;
}
}
/* Destination table add failed. */
if (status)
{
/* Release the transmit packet. */
_nx_packet_transmit_release(packet_ptr);
/* Can't send it. */
return;
}
}
/* Find a valid destination cache, set the nd cache and next hop address. */
else
{
/* Get the destination and next hop address. */
NDCacheEntry = dest_entry_ptr -> nx_ipv6_destination_entry_nd_entry;
COPY_IPV6_ADDRESS(dest_entry_ptr -> nx_ipv6_destination_entry_next_hop, next_hop_address);
NX_ASSERT(NDCacheEntry -> nx_nd_cache_nd_status != ND_CACHE_STATE_INVALID);
}
/* According RFC2461 ch 7.3.3, as long as the entry is valid and not in INCOMPLETE state,
the IP layer should use the cached link layer address. */
if ((NDCacheEntry -> nx_nd_cache_nd_status >= ND_CACHE_STATE_REACHABLE) &&
(NDCacheEntry -> nx_nd_cache_nd_status <= ND_CACHE_STATE_PROBE))
{
UCHAR *mac_addr;
mac_addr = NDCacheEntry -> nx_nd_cache_mac_addr;
/* Assume we find the mac */
driver_request.nx_ip_driver_physical_address_msw = ((ULONG)mac_addr[0] << 8) | mac_addr[1];
driver_request.nx_ip_driver_physical_address_lsw =
((ULONG)mac_addr[2] << 24) | ((ULONG)mac_addr[3] << 16) | ((ULONG)mac_addr[4] << 8) | mac_addr[5];
driver_request.nx_ip_driver_interface = if_ptr;
/* Check if path MTU Discovery is enabled first. */
#ifdef NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
/* It is. To know if we need to fragment this packet we need the path MTU for the packet
destination. */
/* If this destination has a non null next hop, we need to ascertain the next hop MTU. */
/* Get the path MTU for the actual destination. */
next_hop_mtu = dest_entry_ptr -> nx_ipv6_destination_entry_path_mtu;
/* Find the next hop in the destination table. */
status = _nx_icmpv6_dest_table_find(ip_ptr, next_hop_address, &next_hop_dest_entry_ptr, 0, 0);
if (status == NX_SUCCESS)
{
/* Now compare the destination path MTU with the next hop path MTU*/
/*lint -e{644} suppress variable might not be initialized, since "next_hop_dest_entry_ptr" was initialized as long as status is NX_SUCCESS. */
if ((next_hop_dest_entry_ptr -> nx_ipv6_destination_entry_path_mtu > 0) &&
(next_hop_mtu > next_hop_dest_entry_ptr -> nx_ipv6_destination_entry_path_mtu))
{
/* Update the path mtu to reflect the next hop route. */
next_hop_mtu = next_hop_dest_entry_ptr -> nx_ipv6_destination_entry_path_mtu;
}
}
#endif /* NX_ENABLE_IPV6_PATH_MTU_DISCOVERY */
/* If the entry is in STALE state, move it to DELAY state. */
if (NDCacheEntry -> nx_nd_cache_nd_status == ND_CACHE_STATE_STALE)
{
NDCacheEntry -> nx_nd_cache_nd_status = ND_CACHE_STATE_DELAY;
/* Start the Delay first probe timer */
NDCacheEntry -> nx_nd_cache_timer_tick = NX_DELAY_FIRST_PROBE_TIME;
}
}
else
{
/* No MAC address was found in our cache table. Start the Neighbor Discovery (ND)
process to get it. */
/* Ensure the current packet's queue next pointer to NULL */
packet_ptr -> nx_packet_queue_next = NX_NULL;
/* Determine if the queue is empty. */
if (NDCacheEntry -> nx_nd_cache_packet_waiting_head == NX_NULL)
{
/* ICMPv6 is enabled */
if (ip_ptr -> nx_ip_icmpv6_packet_process)
{
/* Queue up this packet */
NDCacheEntry -> nx_nd_cache_packet_waiting_head = packet_ptr;
NDCacheEntry -> nx_nd_cache_packet_waiting_tail = packet_ptr;
NDCacheEntry -> nx_nd_cache_packet_waiting_queue_length = 1;
/* Add debug information. */
NX_PACKET_DEBUG(NX_PACKET_ND_WAITING_QUEUE, __LINE__, packet_ptr);
/* Set the outgoing address and interface to the cache entry. */
NDCacheEntry -> nx_nd_cache_outgoing_address = packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr;
NDCacheEntry -> nx_nd_cache_interface_ptr = if_ptr;
/* Is this a new entry? */
if (NDCacheEntry -> nx_nd_cache_nd_status == ND_CACHE_STATE_CREATED)
{
/* Start Neighbor discovery process by advancing to the incomplete state. */
NDCacheEntry -> nx_nd_cache_nd_status = ND_CACHE_STATE_INCOMPLETE;
}
/* Note that the 2nd last parameter sendUnicast is set to Zero. In this case
the last arg NDCacheEntry is not being used in _nx_icmpv6_send_ns. */
_nx_icmpv6_send_ns(ip_ptr, next_hop_address,
1, packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr, 0, NDCacheEntry);
NDCacheEntry -> nx_nd_cache_num_solicit = NX_MAX_MULTICAST_SOLICIT - 1;
NDCacheEntry -> nx_nd_cache_timer_tick = ip_ptr -> nx_ipv6_retrans_timer_ticks;
}
else
{
_nx_packet_transmit_release(packet_ptr);
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP transmit resource error count. */
ip_ptr -> nx_ip_transmit_resource_errors++;
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
}
return;
}
/* The ND process already started. Simply queue up this packet */
NDCacheEntry -> nx_nd_cache_packet_waiting_tail -> nx_packet_queue_next = packet_ptr;
NDCacheEntry -> nx_nd_cache_packet_waiting_tail = packet_ptr;
NDCacheEntry -> nx_nd_cache_packet_waiting_queue_length++;
/* Add debug information. */
NX_PACKET_DEBUG(NX_PACKET_ND_WAITING_QUEUE, __LINE__, packet_ptr);
/* Check if the number of packets enqueued exceeds the allowed number. */
if (NDCacheEntry -> nx_nd_cache_packet_waiting_queue_length > NX_ND_MAX_QUEUE_DEPTH)
{
/* Yes, so delete the first packet. */
remove_packet = NDCacheEntry -> nx_nd_cache_packet_waiting_head;
NDCacheEntry -> nx_nd_cache_packet_waiting_head = remove_packet -> nx_packet_queue_next;
/* Update the queued packet count for this cache entry. */
NDCacheEntry -> nx_nd_cache_packet_waiting_queue_length--;
_nx_packet_transmit_release(remove_packet);
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP transmit resource error count. */
ip_ptr -> nx_ip_transmit_resource_errors++;
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
}
return;
}
}
}
else
{
/* This IP instance does not require any IP-to-physical mapping. */
/* Build the driver request. */
driver_request.nx_ip_driver_physical_address_msw = 0;
driver_request.nx_ip_driver_physical_address_lsw = 0;
driver_request.nx_ip_driver_interface = if_ptr;
}
/* Does the packet payload exceed next hop MTU? */
if (packet_ptr -> nx_packet_length > next_hop_mtu)
{
#ifndef NX_DISABLE_FRAGMENTATION
#ifdef NX_IPSEC_ENABLE
/* Check the fragment status, transport mode SAs can not carry fragment, RFC 4301 page 66&88. */
/*lint -e{774} suppress boolean always evaluates to True, since the value fragment can changed when NX_IPSEC_ENABLE is defined. */
if (fragment == NX_TRUE)
{
#endif /* NX_IPSEC_ENABLE */
/* Yes; ok to fragment the packet payload. */
_nx_ipv6_fragment_process(&driver_request, next_hop_mtu);
#ifdef NX_IPSEC_ENABLE
}
else
{
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
/* Just release the packet. */
_nx_packet_transmit_release(packet_ptr);
}
#endif /* NX_IPSEC_ENABLE */
#else /* NX_DISABLE_FRAGMENTATION */
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
/* Just release the packet. */
_nx_packet_transmit_release(packet_ptr);
#endif /* NX_DISABLE_FRAGMENTATION */
/* This packet send is complete, just return. */
return;
}
/* The packet requires no fragmentation. Proceed with sending the packet. */
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP packet sent count. */
ip_ptr -> nx_ip_total_packets_sent++;
/* Increment the IP bytes sent count. */
ip_ptr -> nx_ip_total_bytes_sent += packet_ptr -> nx_packet_length - (ULONG)sizeof(NX_IPV6_HEADER);
#endif
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Driver entry must not be NULL. */
NX_ASSERT(if_ptr -> nx_interface_link_driver_entry != NX_NULL);
/* Send the IP packet out on the network via the attached driver. */
(if_ptr -> nx_interface_link_driver_entry)(&driver_request);
}
#endif /* FEATURE_NX_IPV6 */
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