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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 Control Message Protocol (ICMP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
#include "nx_api.h"
#include "nx_packet.h"
#include "nx_ip.h"
#include "nx_ipv6.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
#ifndef NX_DISABLE_ICMPV6_ROUTER_SOLICITATION
static const ULONG _nx_ipv6_all_router_address[4] = {0xff020000, 0, 0, 2};
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_send_rs PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sends an ICMPv6 Router Solicitation message. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* if_index Index of interface */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS: RS packet is sent */
/* NX_NOT_SUCCESSFUL: RS packet is not sent */
/* */
/* CALLS */
/* */
/* _nx_ip_checksum_compute Computer ICMP checksum */
/* _nx_ipv6_packet_send Send ICMPv6 packet out */
/* _nx_packet_allocate Packet allocation function */
/* _nxd_ipv6_interface_find Find outgoing interface for */
/* sending packet */
/* */
/* CALLED BY */
/* */
/* _nxd_ipv6_router_solicitation_check IPv6 router solicitation */
/* timeout routine. */
/* */
/* 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_icmpv6_send_rs(NX_IP *ip_ptr, UINT if_index)
{
USHORT *mac_addr;
NX_PACKET *pkt_ptr;
USHORT checksum;
#if defined(NX_DISABLE_ICMPV6_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
UINT compute_checksum = 1;
#endif /* defined(NX_DISABLE_ICMPV6_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
NX_ICMPV6_RS *rs_ptr;
NX_ICMPV6_OPTION *rs_options;
/* Do not send RS packet if ICMPv6 is not enabled. */
if (ip_ptr -> nx_ip_icmpv6_packet_process == NX_NULL)
{
return(NX_NOT_SUCCESSFUL);
}
/* Allocate a packet to build the ICMPv6 router
solicitation message in. */
#ifdef NX_ENABLE_DUAL_PACKET_POOL
/* Allocate from auxiliary packet pool first. */
if (_nx_packet_allocate(ip_ptr -> nx_ip_auxiliary_packet_pool, &pkt_ptr, (NX_ICMP_PACKET + sizeof(NX_ICMPV6_RS) + 8), NX_NO_WAIT))
{
if (ip_ptr -> nx_ip_auxiliary_packet_pool != ip_ptr -> nx_ip_default_packet_pool)
#endif /* NX_ENABLE_DUAL_PACKET_POOL */
{
if (_nx_packet_allocate(ip_ptr -> nx_ip_default_packet_pool,
&pkt_ptr, (NX_ICMP_PACKET + sizeof(NX_ICMPV6_RS) + 8), NX_NO_WAIT))
{
/* Error getting packet, so just get out! */
return(NX_NOT_SUCCESSFUL);
}
}
#ifdef NX_ENABLE_DUAL_PACKET_POOL
else
{
/* Error getting packet, so just get out! */
return(NX_NOT_SUCCESSFUL);
}
}
#endif /* NX_ENABLE_DUAL_PACKET_POOL */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, pkt_ptr);
/* Find a valid IPv6 address. */
if (_nxd_ipv6_interface_find(ip_ptr, (ULONG *)_nx_ipv6_all_router_address,
&pkt_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr,
&ip_ptr -> nx_ip_interface[if_index]))
{
_nx_packet_release(pkt_ptr);
return(NX_NOT_SUCCESSFUL);
}
/*lint -e{644} suppress variable might not be initialized, since "pkt_ptr" was initialized in _nx_packet_allocate. */
pkt_ptr -> nx_packet_ip_version = NX_IP_VERSION_V6;
/* Set the size of the ICMPv6 router solicitation message. */
/* Size of the message is ICMPv6 + options, which is 8 bytes. */
pkt_ptr -> nx_packet_length = (sizeof(NX_ICMPV6_RS) + 8);
/* Set the prepend pointer. */
pkt_ptr -> nx_packet_prepend_ptr -= pkt_ptr -> nx_packet_length;
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
rs_ptr = (NX_ICMPV6_RS *)(pkt_ptr -> nx_packet_prepend_ptr);
rs_ptr -> nx_icmpv6_rs_icmpv6_header.nx_icmpv6_header_type = NX_ICMPV6_ROUTER_SOLICITATION_TYPE;
rs_ptr -> nx_icmpv6_rs_icmpv6_header.nx_icmpv6_header_code = 0;
rs_ptr -> nx_icmpv6_rs_icmpv6_header.nx_icmpv6_header_checksum = 0;
rs_ptr -> nx_icmpv6_rs_reserved = 0;
/* Get a pointer to the Option header in the ICMPv6 header. */
/*lint -e{923} suppress cast between pointer and ULONG, since it is necessary */
rs_options = (NX_ICMPV6_OPTION *)NX_UCHAR_POINTER_ADD(rs_ptr, sizeof(NX_ICMPV6_RS));
/* Fill in the options field */
rs_options -> nx_icmpv6_option_type = ICMPV6_OPTION_TYPE_SRC_LINK_ADDR;
rs_options -> nx_icmpv6_option_length = 1;
/* Fill in the source mac address. */
mac_addr = &rs_options -> nx_icmpv6_option_data;
mac_addr[0] = (USHORT)(ip_ptr -> nx_ip_interface[if_index].nx_interface_physical_address_msw);
mac_addr[1] = (USHORT)((ip_ptr -> nx_ip_interface[if_index].nx_interface_physical_address_lsw & 0xFFFF0000) >> 16);
mac_addr[2] = (USHORT)(ip_ptr -> nx_ip_interface[if_index].nx_interface_physical_address_lsw & 0x0000FFFF);
/* Byte swapping. */
NX_CHANGE_USHORT_ENDIAN(mac_addr[0]);
NX_CHANGE_USHORT_ENDIAN(mac_addr[1]);
NX_CHANGE_USHORT_ENDIAN(mac_addr[2]);
#ifdef NX_DISABLE_ICMPV6_TX_CHECKSUM
compute_checksum = 0;
#endif /* NX_DISABLE_ICMPV6_TX_CHECKSUM */
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
if (ip_ptr -> nx_ip_interface[if_index].nx_interface_capability_flag & NX_INTERFACE_CAPABILITY_ICMPV6_TX_CHECKSUM)
{
compute_checksum = 0;
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
#if defined(NX_DISABLE_ICMPV6_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
if (compute_checksum)
#endif /* defined(NX_DISABLE_ICMPV6_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
{
/* Compute checksum. The returned value is already in network byte order. */
/*lint -e{929} suppress cast of pointer to pointer, since it is necessary */
checksum = _nx_ip_checksum_compute(pkt_ptr, NX_PROTOCOL_ICMPV6,
(UINT)pkt_ptr -> nx_packet_length,
pkt_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address,
(ULONG *)_nx_ipv6_all_router_address);
checksum = (USHORT)(~checksum);
/* Byte swapping. */
NX_CHANGE_USHORT_ENDIAN(checksum);
rs_ptr -> nx_icmpv6_rs_icmpv6_header.nx_icmpv6_header_checksum = checksum;
}
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
else
{
pkt_ptr -> nx_packet_interface_capability_flag |= NX_INTERFACE_CAPABILITY_ICMPV6_TX_CHECKSUM;
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
/*lint -e{929} suppress cast of pointer to pointer, since it is necessary */
_nx_ipv6_packet_send(ip_ptr, pkt_ptr, NX_PROTOCOL_ICMPV6, pkt_ptr -> nx_packet_length, 255,
pkt_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address,
(ULONG *)_nx_ipv6_all_router_address);
return(NX_SUCCESS);
}
#endif /* NX_DISABLE_ICMPV6_ROUTER_SOLICITATION */
#endif /* FEATURE_NX_IPV6 */
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