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Verify checksums on the RX datapath.

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Simplify checksum generation on the TX datapath.
This commit is contained in:
Michael Brown
2007-01-03 20:48:52 +00:00
parent 285beeff7c
commit a0525a4ed3
8 changed files with 176 additions and 159 deletions
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2
src/include/gpxe/ip.h
View File

@@ -12,7 +12,7 @@
/* IP constants */
#define IP_VER 4
#define IP_VER 0x40
#define IP_MASK_VER 0xf0
#define IP_MASK_HLEN 0x0f
#define IP_MASK_OFFSET 0x1fff

40
src/include/gpxe/tcpip.h
View File

@@ -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 */