diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c')
| -rw-r--r-- | roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c b/roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c new file mode 100644 index 000000000..f4269b8ea --- /dev/null +++ b/roms/edk2/NetworkPkg/Ip4Dxe/Ip4Common.c @@ -0,0 +1,306 @@ +/** @file
+
+Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "Ip4Impl.h"
+
+
+/**
+ Return the cast type (Unicast/Broadcast) specific to an
+ interface. All the addresses are host byte ordered.
+
+ @param[in] IpAddr The IP address to classify in host byte order
+ @param[in] IpIf The interface that IpAddr received from
+
+ @return The cast type of this IP address specific to the interface.
+ @retval IP4_LOCAL_HOST The IpAddr equals to the interface's address
+ @retval IP4_SUBNET_BROADCAST The IpAddr is a directed subnet broadcast to the
+ interface
+ @retval IP4_NET_BROADCAST The IpAddr is a network broadcast to the interface
+ @retval 0 Otherwise.
+
+**/
+INTN
+Ip4GetNetCast (
+ IN IP4_ADDR IpAddr,
+ IN IP4_INTERFACE *IpIf
+ )
+{
+ if (IpAddr == IpIf->Ip) {
+ return IP4_LOCAL_HOST;
+
+ } else if (IpAddr == IpIf->SubnetBrdcast) {
+ return IP4_SUBNET_BROADCAST;
+
+ } else if (IpAddr == IpIf->NetBrdcast) {
+ return IP4_NET_BROADCAST;
+
+ }
+
+ return 0;
+}
+
+
+/**
+ Find the cast type of the packet related to the local host.
+ This isn't the same as link layer cast type. For example, DHCP
+ server may send local broadcast to the local unicast MAC.
+
+ @param[in] IpSb The IP4 service binding instance that received the
+ packet
+ @param[in] Dst The destination address in the packet (host byte
+ order)
+ @param[in] Src The source address in the packet (host byte order)
+
+ @return The cast type for the Dst, it will return on the first non-promiscuous
+ cast type to a configured interface. If the packet doesn't match any of
+ the interface, multicast address and local broadcast address are checked.
+
+**/
+INTN
+Ip4GetHostCast (
+ IN IP4_SERVICE *IpSb,
+ IN IP4_ADDR Dst,
+ IN IP4_ADDR Src
+ )
+{
+ LIST_ENTRY *Entry;
+ IP4_INTERFACE *IpIf;
+ INTN Type;
+ INTN Class;
+
+ Type = 0;
+
+ if (IpSb->MnpConfigData.EnablePromiscuousReceive) {
+ Type = IP4_PROMISCUOUS;
+ }
+
+ //
+ // Go through the interface list of the IP service, most likely.
+ //
+ NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
+ IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
+
+ //
+ // Skip the unconfigured interface and invalid source address:
+ // source address can't be broadcast.
+ //
+ if (!IpIf->Configured || IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
+ continue;
+ }
+
+ if ((Class = Ip4GetNetCast (Dst, IpIf)) > Type) {
+ return Class;
+ }
+ }
+
+ //
+ // If it is local broadcast address. The source address must
+ // be a unicast address on one of the direct connected network.
+ // If it is a multicast address, accept it only if we are in
+ // the group.
+ //
+ if (Dst == IP4_ALLONE_ADDRESS) {
+ IpIf = Ip4FindNet (IpSb, Src);
+
+ if (IpIf != NULL && !IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) {
+ return IP4_LOCAL_BROADCAST;
+ }
+
+ } else if (IP4_IS_MULTICAST (Dst) && Ip4FindGroup (&IpSb->IgmpCtrl, Dst) != NULL) {
+ return IP4_MULTICAST;
+ }
+
+ return Type;
+}
+
+
+/**
+ Find an interface whose configured IP address is Ip.
+
+ @param[in] IpSb The IP4 service binding instance
+ @param[in] Ip The Ip address (host byte order) to find
+
+ @return The IP4_INTERFACE point if found, otherwise NULL
+
+**/
+IP4_INTERFACE *
+Ip4FindInterface (
+ IN IP4_SERVICE *IpSb,
+ IN IP4_ADDR Ip
+ )
+{
+ LIST_ENTRY *Entry;
+ IP4_INTERFACE *IpIf;
+
+ NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
+ IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
+
+ if (IpIf->Configured && (IpIf->Ip == Ip)) {
+ return IpIf;
+ }
+ }
+
+ return NULL;
+}
+
+
+/**
+ Find an interface that Ip is on that connected network.
+
+ @param[in] IpSb The IP4 service binding instance
+ @param[in] Ip The Ip address (host byte order) to find
+
+ @return The IP4_INTERFACE point if found, otherwise NULL
+
+**/
+IP4_INTERFACE *
+Ip4FindNet (
+ IN IP4_SERVICE *IpSb,
+ IN IP4_ADDR Ip
+ )
+{
+ LIST_ENTRY *Entry;
+ IP4_INTERFACE *IpIf;
+
+ NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
+ IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
+
+ if (IpIf->Configured && IP4_NET_EQUAL (Ip, IpIf->Ip, IpIf->SubnetMask)) {
+ return IpIf;
+ }
+ }
+
+ return NULL;
+}
+
+
+/**
+ Find an interface of the service with the same Ip/Netmask pair.
+
+ @param[in] IpSb Ip4 service binding instance
+ @param[in] Ip The Ip address to find (host byte order)
+ @param[in] Netmask The network to find (host byte order)
+
+ @return The IP4_INTERFACE point if found, otherwise NULL
+
+**/
+IP4_INTERFACE *
+Ip4FindStationAddress (
+ IN IP4_SERVICE *IpSb,
+ IN IP4_ADDR Ip,
+ IN IP4_ADDR Netmask
+ )
+{
+ LIST_ENTRY *Entry;
+ IP4_INTERFACE *IpIf;
+
+ NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {
+ IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);
+
+ if (IpIf->Configured && (IpIf->Ip == Ip) && (IpIf->SubnetMask == Netmask)) {
+ return IpIf;
+ }
+ }
+
+ return NULL;
+}
+
+
+/**
+ Get the MAC address for a multicast IP address. Call
+ Mnp's McastIpToMac to find the MAC address in stead of
+ hard code the NIC to be Ethernet.
+
+ @param[in] Mnp The Mnp instance to get the MAC address.
+ @param[in] Multicast The multicast IP address to translate.
+ @param[out] Mac The buffer to hold the translated address.
+
+ @retval EFI_SUCCESS if the multicast IP is successfully translated to a
+ multicast MAC address.
+ @retval other Otherwise some error.
+
+**/
+EFI_STATUS
+Ip4GetMulticastMac (
+ IN EFI_MANAGED_NETWORK_PROTOCOL *Mnp,
+ IN IP4_ADDR Multicast,
+ OUT EFI_MAC_ADDRESS *Mac
+ )
+{
+ EFI_IP_ADDRESS EfiIp;
+
+ EFI_IP4 (EfiIp.v4) = HTONL (Multicast);
+ return Mnp->McastIpToMac (Mnp, FALSE, &EfiIp, Mac);
+}
+
+
+/**
+ Convert the multibyte field in IP header's byter order.
+ In spite of its name, it can also be used to convert from
+ host to network byte order.
+
+ @param[in] Head The IP head to convert
+
+ @return Point to the converted IP head
+
+**/
+IP4_HEAD *
+Ip4NtohHead (
+ IN IP4_HEAD *Head
+ )
+{
+ Head->TotalLen = NTOHS (Head->TotalLen);
+ Head->Id = NTOHS (Head->Id);
+ Head->Fragment = NTOHS (Head->Fragment);
+ Head->Src = NTOHL (Head->Src);
+ Head->Dst = NTOHL (Head->Dst);
+
+ return Head;
+}
+
+
+/**
+ Validate that Ip/Netmask pair is OK to be used as station
+ address. Only continuous netmasks are supported. and check
+ that StationAddress is a unicast address on the network.
+
+ @param[in] Ip The IP address to validate.
+ @param[in] Netmask The netmask of the IP.
+
+ @retval TRUE The Ip/Netmask pair is valid.
+ @retval FALSE The Ip/Netmask pair is invalid.
+
+**/
+BOOLEAN
+Ip4StationAddressValid (
+ IN IP4_ADDR Ip,
+ IN IP4_ADDR Netmask
+ )
+{
+ //
+ // Only support the station address with 0.0.0.0/0 to enable DHCP client.
+ //
+ if (Netmask == IP4_ALLZERO_ADDRESS) {
+ return (BOOLEAN) (Ip == IP4_ALLZERO_ADDRESS);
+ }
+
+ //
+ // Only support the continuous net masks
+ //
+ if (NetGetMaskLength (Netmask) == (IP4_MASK_MAX + 1)) {
+ return FALSE;
+ }
+
+ //
+ // Station address can't be class D or class E address
+ //
+ if (NetGetIpClass (Ip) > IP4_ADDR_CLASSC) {
+ return FALSE;
+ }
+
+ return NetIp4IsUnicast (Ip, Netmask);
+}
|