Add concept of transfer metadata, to be used by UDP in order to

[people/holger/gpxe.git] / src / include / gpxe / xfer.h

diff --git a/src/include/gpxe/xfer.h b/src/include/gpxe/xfer.h
index f946ab1..0224613 100644 (file)
--- a/src/include/gpxe/xfer.h
+++ b/src/include/gpxe/xfer.h
@@ -13,6 +13,7 @@
 #include <gpxe/iobuf.h>
 
 struct xfer_interface;
+struct xfer_metadata;
 
 /** Data transfer interface operations */
 struct xfer_interface_operations {
@@ -63,10 +64,11 @@ struct xfer_interface_operations {
         */
        struct io_buffer * ( * alloc_iob ) ( struct xfer_interface *xfer,
                                             size_t len );
-       /** Deliver datagram as I/O buffer
+       /** Deliver datagram as I/O buffer with metadata
         *
         * @v xfer              Data transfer interface
         * @v iobuf             Datagram I/O buffer
+        * @v meta              Data transfer metadata, or NULL
         * @ret rc              Return status code
         *
         * A data transfer interface that wishes to support only raw
@@ -78,7 +80,8 @@ struct xfer_interface_operations {
         * fatal error.
         */
        int ( * deliver_iob ) ( struct xfer_interface *xfer,
-                               struct io_buffer *iobuf );
+                               struct io_buffer *iobuf,
+                               struct xfer_metadata *meta );
        /** Deliver datagram as raw data
         *
         * @v xfer              Data transfer interface
@@ -106,6 +109,14 @@ struct xfer_interface {
        struct xfer_interface_operations *op;
 };
 
+/** Data transfer metadata */
+struct xfer_metadata {
+       /** Source socket address, or NULL */
+       struct sockaddr *src;
+       /** Destination socket address, or NULL */
+       struct sockaddr *dest;
+};
+
 /** Basis positions for seek() events */
 enum seek_whence {
        SEEK_SET = 0,
@@ -141,6 +152,9 @@ extern struct io_buffer * xfer_alloc_iob ( struct xfer_interface *xfer,
                                           size_t len );
 extern int xfer_deliver_iob ( struct xfer_interface *xfer,
                              struct io_buffer *iobuf );
+extern int xfer_deliver_iob_meta ( struct xfer_interface *xfer,
+                                  struct io_buffer *iobuf,
+                                  struct xfer_metadata *meta );
 extern int xfer_deliver_raw ( struct xfer_interface *xfer,
                              const void *data, size_t len );
 extern int xfer_vprintf ( struct xfer_interface *xfer,
@@ -158,7 +172,8 @@ extern int ignore_xfer_seek ( struct xfer_interface *xfer, off_t offset,
 extern struct io_buffer * default_xfer_alloc_iob ( struct xfer_interface *xfer,
                                                   size_t len );
 extern int xfer_deliver_as_raw ( struct xfer_interface *xfer,
-                                struct io_buffer *iobuf );
+                                struct io_buffer *iobuf,
+                                struct xfer_metadata *meta );
 extern int xfer_deliver_as_iob ( struct xfer_interface *xfer,
                                 const void *data, size_t len );
 extern int ignore_xfer_deliver_raw ( struct xfer_interface *xfer,