Verify checksums on the RX datapath.

[gpxe.git] / src / include / gpxe / tcpip.h

diff --git a/src/include/gpxe/tcpip.h b/src/include/gpxe/tcpip.h
index 6ab2f19..23c6ce7 100644 (file)
--- a/src/include/gpxe/tcpip.h
+++ b/src/include/gpxe/tcpip.h
@@ -14,6 +14,13 @@
 
 struct pk_buff;
 
+/** Empty checksum value
+ *
+ * This is the TCP/IP checksum over a zero-length block of data.
+ */
+#define TCPIP_EMPTY_CSUM 0xffff
+
+/** Length of a @c struct @c sockaddr_tcpip */
 #define SA_TCPIP_LEN 32
 
 /**
@@ -45,30 +52,22 @@ struct tcpip_protocol {
                /**
          * Process received packet
          *
-         * @v pkb      Packet buffer
-        * @v st_src    Partially-filled source address
-        * @v st_dest   Partially-filled destination address
-        * @ret rc      Return status code
+         * @v pkb              Packet buffer
+        * @v st_src            Partially-filled source address
+        * @v st_dest           Partially-filled destination address
+        * @v pshdr_csum        Pseudo-header checksum
+        * @ret rc              Return status code
          *
          * This method takes ownership of the packet buffer.
          */
         int ( * rx ) ( struct pk_buff *pkb, struct sockaddr_tcpip *st_src,
-                      struct sockaddr_tcpip *st_dest );
+                      struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
         /** 
         * Transport-layer protocol number
         *
         * This is a constant of the type IP_XXX
          */
         uint8_t tcpip_proto;
-       /**
-        * Checksum offset
-        *
-        * A negative number indicates that the protocol does not
-        * require checksumming to be performed by the network layer.
-        * A positive number is the offset of the checksum field in
-        * the transport-layer header.
-        */
-       int csum_offset;
 };
 
 /**
@@ -85,13 +84,14 @@ struct tcpip_net_protocol {
         * @v pkb               Packet buffer
         * @v tcpip_protocol    Transport-layer protocol
         * @v st_dest           Destination address
+        * @v trans_csum        Transport-layer checksum to complete, or NULL
         * @ret rc              Return status code
         *
         * This function takes ownership of the packet buffer.
         */
        int ( * tx ) ( struct pk_buff *pkb,
                       struct tcpip_protocol *tcpip_protocol,
-                      struct sockaddr_tcpip *st_dest );
+                      struct sockaddr_tcpip *st_dest, uint16_t *trans_csum );
 };
 
 /** Declare a TCP/IP transport-layer protocol */
@@ -102,11 +102,11 @@ struct tcpip_net_protocol {
 
 extern int tcpip_rx ( struct pk_buff *pkb, uint8_t tcpip_proto,
                      struct sockaddr_tcpip *st_src,
-                     struct sockaddr_tcpip *st_dest );
+                     struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum );
 extern int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip, 
-                     struct sockaddr_tcpip *st_dest );
-extern unsigned int tcpip_continue_chksum ( unsigned int partial,
-                                           const void *data, size_t len );
-extern unsigned int tcpip_chksum ( const void *data, size_t len );
+                     struct sockaddr_tcpip *st_dest, uint16_t *trans_csum );
+extern uint16_t tcpip_continue_chksum ( uint16_t partial,
+                                       const void *data, size_t len );
+extern uint16_t tcpip_chksum ( const void *data, size_t len );
 
 #endif /* _GPXE_TCPIP_H */