mirror of https://github.com/acidanthera/audk.git
662 lines
17 KiB
C
662 lines
17 KiB
C
/** @file
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Copyright (c) 2005 - 2006, Intel Corporation.<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "Ip4Impl.h"
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/**
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Allocate a route entry then initialize it with the Dest/Netmaks
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and Gateway.
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@param[in] Dest The destination network
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@param[in] Netmask The destination network mask
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@param[in] GateWay The nexthop address
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@return NULL if failed to allocate memeory, otherwise the newly created
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route entry.
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**/
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IP4_ROUTE_ENTRY *
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Ip4CreateRouteEntry (
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IN IP4_ADDR Dest,
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IN IP4_ADDR Netmask,
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IN IP4_ADDR GateWay
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)
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{
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IP4_ROUTE_ENTRY *RtEntry;
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RtEntry = AllocatePool (sizeof (IP4_ROUTE_ENTRY));
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if (RtEntry == NULL) {
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return NULL;
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}
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InitializeListHead (&RtEntry->Link);
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RtEntry->RefCnt = 1;
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RtEntry->Dest = Dest;
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RtEntry->Netmask = Netmask;
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RtEntry->NextHop = GateWay;
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RtEntry->Flag = 0;
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return RtEntry;
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}
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/**
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Free the route table entry. It is reference counted.
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@param RtEntry The route entry to free.
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**/
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VOID
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Ip4FreeRouteEntry (
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IN IP4_ROUTE_ENTRY *RtEntry
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)
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{
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ASSERT (RtEntry->RefCnt > 0);
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if (--RtEntry->RefCnt == 0) {
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gBS->FreePool (RtEntry);
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}
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}
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/**
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Allocate and initialize an IP4 route cache entry.
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@param[in] Dst The destination address
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@param[in] Src The source address
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@param[in] GateWay The next hop address
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@param[in] Tag The tag from the caller. This marks all the cache
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entries spawned from one route table entry.
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@return NULL if failed to allocate memory for the cache, other point
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to the created route cache entry.
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**/
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IP4_ROUTE_CACHE_ENTRY *
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Ip4CreateRouteCacheEntry (
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IN IP4_ADDR Dst,
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IN IP4_ADDR Src,
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IN IP4_ADDR GateWay,
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IN UINTN Tag
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)
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{
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IP4_ROUTE_CACHE_ENTRY *RtCacheEntry;
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RtCacheEntry = AllocatePool (sizeof (IP4_ROUTE_CACHE_ENTRY));
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if (RtCacheEntry == NULL) {
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return NULL;
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}
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InitializeListHead (&RtCacheEntry->Link);
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RtCacheEntry->RefCnt = 1;
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RtCacheEntry->Dest = Dst;
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RtCacheEntry->Src = Src;
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RtCacheEntry->NextHop = GateWay;
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RtCacheEntry->Tag = Tag;
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return RtCacheEntry;
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}
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/**
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Free the route cache entry. It is reference counted.
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@param RtCacheEntry The route cache entry to free.
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**/
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VOID
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Ip4FreeRouteCacheEntry (
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IN IP4_ROUTE_CACHE_ENTRY *RtCacheEntry
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)
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{
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ASSERT (RtCacheEntry->RefCnt > 0);
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if (--RtCacheEntry->RefCnt == 0) {
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gBS->FreePool (RtCacheEntry);
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}
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}
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/**
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Initialize an empty route cache table.
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@param[in, out] RtCache The rotue cache table to initialize.
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**/
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VOID
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Ip4InitRouteCache (
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IN OUT IP4_ROUTE_CACHE *RtCache
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)
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{
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UINT32 Index;
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for (Index = 0; Index < IP4_ROUTE_CACHE_HASH; Index++) {
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InitializeListHead (&(RtCache->CacheBucket[Index]));
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}
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}
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/**
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Clean up a route cache, that is free all the route cache
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entries enqueued in the cache.
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@param[in] RtCache The route cache table to clean up
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**/
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VOID
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Ip4CleanRouteCache (
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IN IP4_ROUTE_CACHE *RtCache
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)
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{
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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IP4_ROUTE_CACHE_ENTRY *RtCacheEntry;
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UINT32 Index;
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for (Index = 0; Index < IP4_ROUTE_CACHE_HASH; Index++) {
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NET_LIST_FOR_EACH_SAFE (Entry, Next, &(RtCache->CacheBucket[Index])) {
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RtCacheEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_CACHE_ENTRY, Link);
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RemoveEntryList (Entry);
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Ip4FreeRouteCacheEntry (RtCacheEntry);
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}
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}
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}
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/**
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Create an empty route table, includes its internal route cache
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@return NULL if failed to allocate memory for the route table, otherwise
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the point to newly created route table.
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**/
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IP4_ROUTE_TABLE *
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Ip4CreateRouteTable (
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VOID
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)
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{
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IP4_ROUTE_TABLE *RtTable;
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UINT32 Index;
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RtTable = AllocatePool (sizeof (IP4_ROUTE_TABLE));
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if (RtTable == NULL) {
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return NULL;
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}
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RtTable->RefCnt = 1;
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RtTable->TotalNum = 0;
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for (Index = 0; Index < IP4_MASK_NUM; Index++) {
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InitializeListHead (&(RtTable->RouteArea[Index]));
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}
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RtTable->Next = NULL;
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Ip4InitRouteCache (&RtTable->Cache);
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return RtTable;
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}
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/**
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Free the route table and its associated route cache. Route
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table is reference counted.
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@param[in] RtTable The route table to free.
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**/
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VOID
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Ip4FreeRouteTable (
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IN IP4_ROUTE_TABLE *RtTable
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)
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{
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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IP4_ROUTE_ENTRY *RtEntry;
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UINT32 Index;
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ASSERT (RtTable->RefCnt > 0);
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if (--RtTable->RefCnt > 0) {
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return ;
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}
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//
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// Free all the route table entry and its route cache.
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//
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for (Index = 0; Index < IP4_MASK_NUM; Index++) {
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NET_LIST_FOR_EACH_SAFE (Entry, Next, &(RtTable->RouteArea[Index])) {
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RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
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RemoveEntryList (Entry);
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Ip4FreeRouteEntry (RtEntry);
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}
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}
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Ip4CleanRouteCache (&RtTable->Cache);
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gBS->FreePool (RtTable);
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}
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/**
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Remove all the cache entries bearing the Tag. When a route cache
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entry is created, it is tagged with the address of route entry
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from which it is spawned. When a route entry is deleted, the cache
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entries spawned from it are also deleted.
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@param RtCache Route cache to remove the entries from
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@param Tag The Tag of the entries to remove
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**/
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VOID
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Ip4PurgeRouteCache (
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IN OUT IP4_ROUTE_CACHE *RtCache,
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IN UINTN Tag
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)
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{
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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IP4_ROUTE_CACHE_ENTRY *RtCacheEntry;
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UINT32 Index;
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for (Index = 0; Index < IP4_ROUTE_CACHE_HASH; Index++) {
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NET_LIST_FOR_EACH_SAFE (Entry, Next, &RtCache->CacheBucket[Index]) {
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RtCacheEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_CACHE_ENTRY, Link);
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if (RtCacheEntry->Tag == Tag) {
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RemoveEntryList (Entry);
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Ip4FreeRouteCacheEntry (RtCacheEntry);
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}
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}
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}
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}
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/**
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Add a route entry to the route table. All the IP4_ADDRs are in
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host byte order.
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@param[in, out] RtTable Route table to add route to
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@param[in] Dest The destination of the network
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@param[in] Netmask The netmask of the destination
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@param[in] Gateway The next hop address
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@retval EFI_ACCESS_DENIED The same route already exists
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@retval EFI_OUT_OF_RESOURCES Failed to allocate memory for the entry
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@retval EFI_SUCCESS The route is added successfully.
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**/
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EFI_STATUS
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Ip4AddRoute (
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IN OUT IP4_ROUTE_TABLE *RtTable,
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IN IP4_ADDR Dest,
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IN IP4_ADDR Netmask,
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IN IP4_ADDR Gateway
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)
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{
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LIST_ENTRY *Head;
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LIST_ENTRY *Entry;
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IP4_ROUTE_ENTRY *RtEntry;
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//
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// All the route entries with the same netmask length are
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// linke to the same route area
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//
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Head = &(RtTable->RouteArea[NetGetMaskLength (Netmask)]);
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//
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// First check whether the route exists
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//
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NET_LIST_FOR_EACH (Entry, Head) {
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RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
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if (IP4_NET_EQUAL (RtEntry->Dest, Dest, Netmask) && (RtEntry->NextHop == Gateway)) {
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return EFI_ACCESS_DENIED;
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}
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}
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//
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// Create a route entry and insert it to the route area.
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//
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RtEntry = Ip4CreateRouteEntry (Dest, Netmask, Gateway);
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if (RtEntry == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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if (Gateway == IP4_ALLZERO_ADDRESS) {
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RtEntry->Flag = IP4_DIRECT_ROUTE;
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}
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InsertHeadList (Head, &RtEntry->Link);
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RtTable->TotalNum++;
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return EFI_SUCCESS;
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}
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/**
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Remove a route entry and all the route caches spawn from it.
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@param RtTable The route table to remove the route from
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@param Dest The destination network
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@param Netmask The netmask of the Dest
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@param Gateway The next hop address
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@retval EFI_SUCCESS The route entry is successfully removed
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@retval EFI_NOT_FOUND There is no route entry in the table with that
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properity.
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**/
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EFI_STATUS
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Ip4DelRoute (
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IN OUT IP4_ROUTE_TABLE *RtTable,
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IN IP4_ADDR Dest,
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IN IP4_ADDR Netmask,
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IN IP4_ADDR Gateway
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)
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{
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LIST_ENTRY *Head;
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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IP4_ROUTE_ENTRY *RtEntry;
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Head = &(RtTable->RouteArea[NetGetMaskLength (Netmask)]);
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NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {
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RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
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if (IP4_NET_EQUAL (RtEntry->Dest, Dest, Netmask) && (RtEntry->NextHop == Gateway)) {
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Ip4PurgeRouteCache (&RtTable->Cache, (UINTN) RtEntry);
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RemoveEntryList (Entry);
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Ip4FreeRouteEntry (RtEntry);
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RtTable->TotalNum--;
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return EFI_SUCCESS;
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}
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}
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return EFI_NOT_FOUND;
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}
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/**
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Find a route cache with the dst and src. This is used by ICMP
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redirect messasge process. All kinds of redirect is treated as
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host redirect according to RFC1122. So, only route cache entries
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are modified according to the ICMP redirect message.
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@param[in] RtTable The route table to search the cache for
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@param[in] Dest The destination address
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@param[in] Src The source address
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@return NULL if no route entry to the (Dest, Src). Otherwise the point
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to the correct route cache entry.
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**/
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IP4_ROUTE_CACHE_ENTRY *
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Ip4FindRouteCache (
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IN IP4_ROUTE_TABLE *RtTable,
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IN IP4_ADDR Dest,
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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_ROUTE_CACHE_ENTRY *RtCacheEntry;
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UINT32 Index;
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Index = IP4_ROUTE_CACHE_HASH (Dest, Src);
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NET_LIST_FOR_EACH (Entry, &RtTable->Cache.CacheBucket[Index]) {
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RtCacheEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_CACHE_ENTRY, Link);
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if ((RtCacheEntry->Dest == Dest) && (RtCacheEntry->Src == Src)) {
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NET_GET_REF (RtCacheEntry);
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return RtCacheEntry;
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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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Search the route table for a most specific match to the Dst. It searches
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from the longest route area (mask length == 32) to the shortest route area
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(default routes). In each route area, it will first search the instance's
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route table, then the default route table. This is required by the following
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requirements:
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1. IP search the route table for a most specific match
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2. The local route entries have precedence over the default route entry.
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@param[in] RtTable The route table to search from
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@param[in] Dst The destionation address to search
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@return NULL if no route matches the Dst, otherwise the point to the
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most specific route to the Dst.
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**/
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IP4_ROUTE_ENTRY *
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Ip4FindRouteEntry (
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IN IP4_ROUTE_TABLE *RtTable,
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IN IP4_ADDR Dst
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)
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{
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LIST_ENTRY *Entry;
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IP4_ROUTE_ENTRY *RtEntry;
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IP4_ROUTE_TABLE *Table;
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INTN Index;
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RtEntry = NULL;
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for (Index = IP4_MASK_NUM - 1; Index >= 0; Index--) {
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for (Table = RtTable; Table != NULL; Table = Table->Next) {
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NET_LIST_FOR_EACH (Entry, &Table->RouteArea[Index]) {
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RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
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if (IP4_NET_EQUAL (RtEntry->Dest, Dst, RtEntry->Netmask)) {
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NET_GET_REF (RtEntry);
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return RtEntry;
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}
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}
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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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Search the route table to route the packet. Return/create a route
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cache if there is a route to the destination.
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@param[in] RtTable The route table to search from
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@param[in] Dest The destination address to search for
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@param[in] Src The source address to search for
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@return NULL if failed to route packet, otherwise a route cache
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entry that can be used to route packet.
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**/
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IP4_ROUTE_CACHE_ENTRY *
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Ip4Route (
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IN IP4_ROUTE_TABLE *RtTable,
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IN IP4_ADDR Dest,
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IN IP4_ADDR Src
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)
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{
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LIST_ENTRY *Head;
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LIST_ENTRY *Entry;
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LIST_ENTRY *Next;
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IP4_ROUTE_CACHE_ENTRY *RtCacheEntry;
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IP4_ROUTE_CACHE_ENTRY *Cache;
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IP4_ROUTE_ENTRY *RtEntry;
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IP4_ADDR NextHop;
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UINT32 Count;
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ASSERT (RtTable != NULL);
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Head = &RtTable->Cache.CacheBucket[IP4_ROUTE_CACHE_HASH (Dest, Src)];
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RtCacheEntry = Ip4FindRouteCache (RtTable, Dest, Src);
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//
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// If found, promote the cache entry to the head of the hash bucket. LRU
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//
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if (RtCacheEntry != NULL) {
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RemoveEntryList (&RtCacheEntry->Link);
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InsertHeadList (Head, &RtCacheEntry->Link);
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return RtCacheEntry;
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}
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//
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// Search the route table for the most specific route
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//
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RtEntry = Ip4FindRouteEntry (RtTable, Dest);
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if (RtEntry == NULL) {
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return NULL;
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}
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//
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// Found a route to the Dest, if it is a direct route, the packet
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// will be sent directly to the destination, such as for connected
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// network. Otherwise, it is an indirect route, the packet will be
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// sent to the next hop router.
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//
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if ((RtEntry->Flag & IP4_DIRECT_ROUTE) != 0) {
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NextHop = Dest;
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} else {
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NextHop = RtEntry->NextHop;
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}
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Ip4FreeRouteEntry (RtEntry);
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//
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// Create a route cache entry, and tag it as spawned from this route entry
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//
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RtCacheEntry = Ip4CreateRouteCacheEntry (Dest, Src, NextHop, (UINTN) RtEntry);
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if (RtCacheEntry == NULL) {
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return NULL;
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}
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InsertHeadList (Head, &RtCacheEntry->Link);
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NET_GET_REF (RtCacheEntry);
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//
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// Each bucket of route cache can contain at most 64 entries.
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// Remove the entries at the tail of the bucket. These entries
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// are likely to be used least.
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//
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Count = 0;
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NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {
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if (++Count < IP4_ROUTE_CACHE_MAX) {
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continue;
|
|
}
|
|
|
|
Cache = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_CACHE_ENTRY, Link);
|
|
|
|
RemoveEntryList (Entry);
|
|
Ip4FreeRouteCacheEntry (Cache);
|
|
}
|
|
|
|
return RtCacheEntry;
|
|
}
|
|
|
|
|
|
/**
|
|
Build a EFI_IP4_ROUTE_TABLE to be returned to the caller of
|
|
GetModeData. The EFI_IP4_ROUTE_TABLE is clumsy to use in the
|
|
internal operation of the IP4 driver.
|
|
|
|
@param[in] IpInstance The IP4 child that requests the route table.
|
|
|
|
@retval EFI_SUCCESS The route table is successfully build
|
|
@retval EFI_OUT_OF_RESOURCES Failed to allocate the memory for the rotue table.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
Ip4BuildEfiRouteTable (
|
|
IN IP4_PROTOCOL *IpInstance
|
|
)
|
|
{
|
|
LIST_ENTRY *Entry;
|
|
IP4_ROUTE_TABLE *RtTable;
|
|
IP4_ROUTE_ENTRY *RtEntry;
|
|
EFI_IP4_ROUTE_TABLE *Table;
|
|
UINT32 Count;
|
|
INT32 Index;
|
|
|
|
RtTable = IpInstance->RouteTable;
|
|
|
|
if (IpInstance->EfiRouteTable != NULL) {
|
|
gBS->FreePool (IpInstance->EfiRouteTable);
|
|
|
|
IpInstance->EfiRouteTable = NULL;
|
|
IpInstance->EfiRouteCount = 0;
|
|
}
|
|
|
|
Count = RtTable->TotalNum;
|
|
|
|
if (RtTable->Next != NULL) {
|
|
Count += RtTable->Next->TotalNum;
|
|
}
|
|
|
|
if (Count == 0) {
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
Table = AllocatePool (sizeof (EFI_IP4_ROUTE_TABLE) * Count);
|
|
|
|
if (Table == NULL) {
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
//
|
|
// Copy the route entry to EFI route table. Keep the order of
|
|
// route entry copied from most specific to default route. That
|
|
// is, interlevel the route entry from the instance's route area
|
|
// and those from the default route table's route area.
|
|
//
|
|
Count = 0;
|
|
|
|
for (Index = IP4_MASK_NUM - 1; Index >= 0; Index--) {
|
|
for (RtTable = IpInstance->RouteTable; RtTable != NULL; RtTable = RtTable->Next) {
|
|
NET_LIST_FOR_EACH (Entry, &(RtTable->RouteArea[Index])) {
|
|
RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
|
|
|
|
EFI_IP4 (Table[Count].SubnetAddress) = HTONL (RtEntry->Dest & RtEntry->Netmask);
|
|
EFI_IP4 (Table[Count].SubnetMask) = HTONL (RtEntry->Netmask);
|
|
EFI_IP4 (Table[Count].GatewayAddress) = HTONL (RtEntry->NextHop);
|
|
|
|
Count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
IpInstance->EfiRouteTable = Table;
|
|
IpInstance->EfiRouteCount = Count;
|
|
return EFI_SUCCESS;
|
|
}
|