Update IPsec.h file to follow approved ECR which will be collected into future UEFI...

[mirror_edk2.git] / MdeModulePkg / Library / DxeNetLib / NetBuffer.c

diff --git a/MdeModulePkg/Library/DxeNetLib/NetBuffer.c b/MdeModulePkg/Library/DxeNetLib/NetBuffer.c
index f29ef963318b4b10a75db88f9188cadd744c0b87..bbbdbc048aedc45acacc1b462f57e20d1beb69e1 100644 (file)
--- a/MdeModulePkg/Library/DxeNetLib/NetBuffer.c
+++ b/MdeModulePkg/Library/DxeNetLib/NetBuffer.c
@@ -1,8 +1,8 @@
 /** @file\r
   Network library functions providing net buffer operation support.\r
 \r
-Copyright (c) 2005 - 2010, Intel Corporation.<BR>\r
-All rights reserved. This program and the accompanying materials\r
+Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>\r
+This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
 http://opensource.org/licenses/bsd-license.php\r
@@ -1842,3 +1842,51 @@ NetIp6PseudoHeadChecksum (
   return NetblockChecksum ((UINT8 *) &Hdr, sizeof (Hdr));\r
 }\r
 \r
+/**\r
+  The function frees the net buffer which allocated by the IP protocol. It releases \r
+  only the net buffer and doesn't call the external free function. \r
+\r
+  This function should be called after finishing the process of mIpSec->ProcessExt() \r
+  for outbound traffic. The (EFI_IPSEC2_PROTOCOL)->ProcessExt() allocates a new \r
+  buffer for the ESP, so there needs a function to free the old net buffer.\r
+\r
+  @param[in]  Nbuf       The network buffer to be freed.\r
+\r
+**/\r
+VOID\r
+NetIpSecNetbufFree (\r
+  NET_BUF   *Nbuf\r
+  )\r
+{\r
+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);\r
+  ASSERT (Nbuf->RefCnt > 0);\r
+\r
+  Nbuf->RefCnt--;\r
+\r
+  if (Nbuf->RefCnt == 0) {\r
+    \r
+    //\r
+    // Update Vector only when NBuf is to be released. That is,\r
+    // all the sharing of Nbuf increse Vector's RefCnt by one\r
+    //\r
+    NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);\r
+    ASSERT (Nbuf->Vector->RefCnt > 0);\r
+\r
+    Nbuf->Vector->RefCnt--;\r
+\r
+    if (Nbuf->Vector->RefCnt > 0) {\r
+      return;\r
+    }\r
+\r
+    //\r
+    // If NET_VECTOR_OWN_FIRST is set, release the first block since it is \r
+    // allocated by us\r
+    //\r
+    if ((Nbuf->Vector->Flag & NET_VECTOR_OWN_FIRST) != 0) {\r
+      FreePool (Nbuf->Vector->Block[0].Bulk);\r
+    }\r
+    FreePool (Nbuf->Vector);\r
+    FreePool (Nbuf); \r
+  } \r
+}\r
+\r