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307 lines
8.0 KiB
C
307 lines
8.0 KiB
C
/** @file
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Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Ip4Impl.h"
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/**
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Return the cast type (Unicast/Boradcast) specific to an
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interface. All the addresses are host byte ordered.
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@param[in] IpAddr The IP address to classify in host byte order
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@param[in] IpIf The interface that IpAddr received from
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@return The cast type of this IP address specific to the interface.
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@retval IP4_LOCAL_HOST The IpAddr equals to the interface's address
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@retval IP4_SUBNET_BROADCAST The IpAddr is a directed subnet boradcast to the
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interface
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@retval IP4_NET_BROADCAST The IpAddr is a network broadcast to the interface
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@retval 0 Otherwise.
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**/
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INTN
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Ip4GetNetCast (
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IN IP4_ADDR IpAddr,
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IN IP4_INTERFACE *IpIf
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)
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{
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if (IpAddr == IpIf->Ip) {
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return IP4_LOCAL_HOST;
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} else if (IpAddr == IpIf->SubnetBrdcast) {
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return IP4_SUBNET_BROADCAST;
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} else if (IpAddr == IpIf->NetBrdcast) {
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return IP4_NET_BROADCAST;
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}
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return 0;
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}
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/**
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Find the cast type of the packet related to the local host.
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This isn't the same as link layer cast type. For example, DHCP
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server may send local broadcast to the local unicast MAC.
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@param[in] IpSb The IP4 service binding instance that received the
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packet
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@param[in] Dst The destination address in the packet (host byte
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order)
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@param[in] Src The source address in the packet (host byte order)
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@return The cast type for the Dst, it will return on the first non-promiscuous
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cast type to a configured interface. If the packet doesn't match any of
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the interface, multicast address and local broadcast address are checked.
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**/
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INTN
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Ip4GetHostCast (
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IN IP4_SERVICE *IpSb,
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IN IP4_ADDR Dst,
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IN IP4_ADDR Src
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)
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{
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LIST_ENTRY *Entry;
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IP4_INTERFACE *IpIf;
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INTN Type;
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INTN Class;
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Type = 0;
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if (IpSb->MnpConfigData.EnablePromiscuousReceive) {
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Type = IP4_PROMISCUOUS;
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}
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//
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// Go through the interface list of the IP service, most likely.
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//
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NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
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IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
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//
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// Skip the unconfigured interface and invalid source address:
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// source address can't be broadcast.
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//
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if (!IpIf->Configured || IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
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continue;
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}
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if ((Class = Ip4GetNetCast (Dst, IpIf)) > Type) {
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return Class;
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}
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}
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//
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// If it is local broadcast address. The source address must
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// be a unicast address on one of the direct connected network.
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// If it is a multicast address, accept it only if we are in
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// the group.
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//
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if (Dst == IP4_ALLONE_ADDRESS) {
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IpIf = Ip4FindNet (IpSb, Src);
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if (IpIf != NULL && !IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
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return IP4_LOCAL_BROADCAST;
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}
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} else if (IP4_IS_MULTICAST (Dst) && Ip4FindGroup (&IpSb->IgmpCtrl, Dst) != NULL) {
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return IP4_MULTICAST;
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}
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return Type;
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}
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/**
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Find an interface whose configured IP address is Ip.
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@param[in] IpSb The IP4 service binding instance
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@param[in] Ip The Ip address (host byte order) to find
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@return The IP4_INTERFACE point if found, otherwise NULL
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**/
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IP4_INTERFACE *
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Ip4FindInterface (
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IN IP4_SERVICE *IpSb,
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IN IP4_ADDR Ip
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)
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{
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LIST_ENTRY *Entry;
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IP4_INTERFACE *IpIf;
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NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
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IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
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if (IpIf->Configured && (IpIf->Ip == Ip)) {
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return IpIf;
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}
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}
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return NULL;
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}
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/**
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Find an interface that Ip is on that connected network.
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@param[in] IpSb The IP4 service binding instance
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@param[in] Ip The Ip address (host byte order) to find
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@return The IP4_INTERFACE point if found, otherwise NULL
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**/
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IP4_INTERFACE *
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Ip4FindNet (
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IN IP4_SERVICE *IpSb,
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IN IP4_ADDR Ip
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)
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{
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LIST_ENTRY *Entry;
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IP4_INTERFACE *IpIf;
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NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
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IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
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if (IpIf->Configured && IP4_NET_EQUAL (Ip, IpIf->Ip, IpIf->SubnetMask)) {
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return IpIf;
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}
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}
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return NULL;
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}
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/**
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Find an interface of the service with the same Ip/Netmask pair.
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@param[in] IpSb Ip4 service binding instance
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@param[in] Ip The Ip adress to find (host byte order)
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@param[in] Netmask The network to find (host byte order)
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@return The IP4_INTERFACE point if found, otherwise NULL
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**/
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IP4_INTERFACE *
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Ip4FindStationAddress (
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IN IP4_SERVICE *IpSb,
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IN IP4_ADDR Ip,
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IN IP4_ADDR Netmask
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)
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{
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LIST_ENTRY *Entry;
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IP4_INTERFACE *IpIf;
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NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
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IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
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if (IpIf->Configured && (IpIf->Ip == Ip) && (IpIf->SubnetMask == Netmask)) {
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return IpIf;
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}
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}
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return NULL;
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}
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/**
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Get the MAC address for a multicast IP address. Call
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Mnp's McastIpToMac to find the MAC address in stead of
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hard code the NIC to be Ethernet.
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@param[in] Mnp The Mnp instance to get the MAC address.
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@param[in] Multicast The multicast IP address to translate.
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@param[out] Mac The buffer to hold the translated address.
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@retval EFI_SUCCESS if the multicast IP is successfully translated to a
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multicast MAC address.
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@retval other Otherwise some error.
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**/
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EFI_STATUS
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Ip4GetMulticastMac (
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IN EFI_MANAGED_NETWORK_PROTOCOL *Mnp,
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IN IP4_ADDR Multicast,
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OUT EFI_MAC_ADDRESS *Mac
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)
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{
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EFI_IP_ADDRESS EfiIp;
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EFI_IP4 (EfiIp.v4) = HTONL (Multicast);
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return Mnp->McastIpToMac (Mnp, FALSE, &EfiIp, Mac);
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}
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/**
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Convert the multibyte field in IP header's byter order.
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In spite of its name, it can also be used to convert from
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host to network byte order.
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@param[in] Head The IP head to convert
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@return Point to the converted IP head
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**/
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IP4_HEAD *
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Ip4NtohHead (
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IN IP4_HEAD *Head
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)
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{
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Head->TotalLen = NTOHS (Head->TotalLen);
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Head->Id = NTOHS (Head->Id);
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Head->Fragment = NTOHS (Head->Fragment);
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Head->Src = NTOHL (Head->Src);
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Head->Dst = NTOHL (Head->Dst);
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return Head;
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}
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/**
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Validate that Ip/Netmask pair is OK to be used as station
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address. Only continuous netmasks are supported. and check
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that StationAddress is a unicast address on the newtwork.
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@param[in] Ip The IP address to validate.
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@param[in] Netmask The netmaks of the IP.
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@retval TRUE The Ip/Netmask pair is valid.
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@retval FALSE The Ip/Netmask pair is invalid.
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**/
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BOOLEAN
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Ip4StationAddressValid (
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IN IP4_ADDR Ip,
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IN IP4_ADDR Netmask
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)
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{
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//
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// Only support the station address with 0.0.0.0/0 to enable DHCP client.
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//
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if (Netmask == IP4_ALLZERO_ADDRESS) {
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return (BOOLEAN) (Ip == IP4_ALLZERO_ADDRESS);
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}
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//
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// Only support the continuous net masks
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//
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if (NetGetMaskLength (Netmask) == (IP4_MASK_MAX + 1)) {
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return FALSE;
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}
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//
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// Station address can't be class D or class E address
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//
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if (NetGetIpClass (Ip) > IP4_ADDR_CLASSC) {
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return FALSE;
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}
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return NetIp4IsUnicast (Ip, Netmask);
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}
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