1. Add Link MTU support to IP4 and TCP4 driver.

[mirror_edk2.git] / MdeModulePkg / Universal / Network / Ip4Dxe / Ip4Output.h

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.h b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.h
index 8bd2ad8a54bd962dd35d7d898585b078334c56d7..3f0485f631e65f9df9548674e9875aff46beb498 100644 (file)
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.h
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.h
@@ -95,5 +95,32 @@ Ip4CancelPacket (
   IN EFI_STATUS       IoStatus\r
   );\r
 \r
+/**\r
+  Prepend an IP4 head to the Packet. It will copy the options and\r
+  build the IP4 header fields. Used for IP4 fragmentation.\r
+\r
+  @param  Packet           The packet to prepend IP4 header to\r
+  @param  Head             The caller supplied header. The caller should set\r
+                           the following header fields: Tos, TotalLen, Id,\r
+                           Fragment, Ttl, Protocol, Src and Dst. All the fields\r
+                           are in host byte order. This function will fill in\r
+                           the Ver, HeadLen, and checksum.\r
+  @param  Option           The orginal IP4 option to copy from\r
+  @param  OptLen           The length of the IP4 option\r
+\r
+  @retval EFI_BAD_BUFFER_SIZE  There is no enought room in the head space of\r
+                               Packet.\r
+  @retval EFI_SUCCESS          The IP4 header is successfully added to the packet.\r
+\r
+**/\r
+EFI_STATUS\r
+Ip4PrependHead (\r
+  IN OUT NET_BUF                *Packet,\r
+  IN     IP4_HEAD               *Head,\r
+  IN     UINT8                  *Option,\r
+  IN     UINT32                 OptLen\r
+  );\r
+\r
 extern UINT16  mIp4Id;\r
+\r
 #endif\r