sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2025-12-29 02:52:36 +03:00
Code Issues Packages Projects Releases Wiki Activity

Verify checksums on the RX datapath.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

22
src/net/tcpip.c
View File

@@ -32,6 +32,7 @@ tcpip_protocols_end[0] __table_end ( tcpip_protocols );
* @v tcpip_proto Transport-layer protocol number
* @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 function expects a transport-layer segment from the network
@@ -42,14 +43,15 @@ tcpip_protocols_end[0] __table_end ( tcpip_protocols );
*/
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 ) {
struct tcpip_protocol *tcpip;
/* Hand off packet to the appropriate transport-layer protocol */
for ( tcpip = tcpip_protocols; tcpip < tcpip_protocols_end; tcpip++ ) {
if ( tcpip->tcpip_proto == tcpip_proto ) {
DBG ( "TCP/IP received %s packet\n", tcpip->name );
return tcpip->rx ( pkb, st_src, st_dest );
return tcpip->rx ( pkb, st_src, st_dest, pshdr_csum );
}
}
@@ -63,10 +65,11 @@ int tcpip_rx ( struct pk_buff *pkb, uint8_t tcpip_proto,
* @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
*/
int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip_protocol,
struct sockaddr_tcpip *st_dest ) {
struct sockaddr_tcpip *st_dest, uint16_t *trans_csum ) {
struct tcpip_net_protocol *tcpip_net;
/* Hand off packet to the appropriate network-layer protocol */
@@ -74,7 +77,8 @@ int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip_protocol,
tcpip_net < tcpip_net_protocols_end ; tcpip_net++ ) {
if ( tcpip_net->sa_family == st_dest->st_family ) {
DBG ( "TCP/IP sending %s packet\n", tcpip_net->name );
return tcpip_net->tx ( pkb, tcpip_protocol, st_dest );
return tcpip_net->tx ( pkb, tcpip_protocol, st_dest,
trans_csum );
}
}
@@ -101,8 +105,8 @@ int tcpip_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip_protocol,
* or both. Deciding which to swap is left as an exercise for the
* interested reader.
*/
unsigned int tcpip_continue_chksum ( unsigned int partial, const void *data,
size_t len ) {
uint16_t tcpip_continue_chksum ( uint16_t partial, const void *data,
size_t len ) {
unsigned int cksum = ( ( ~partial ) & 0xffff );
unsigned int value;
unsigned int i;
@@ -121,7 +125,7 @@ unsigned int tcpip_continue_chksum ( unsigned int partial, const void *data,
cksum -= 0xffff;
}
return ( ( ~cksum ) & 0xffff );
return ( ~cksum );
}
/**
@@ -134,6 +138,6 @@ unsigned int tcpip_continue_chksum ( unsigned int partial, const void *data,
* Calculates a TCP/IP-style 16-bit checksum over the data block. The
* checksum is returned in network byte order.
*/
unsigned int tcpip_chksum ( const void *data, size_t len ) {
return tcpip_continue_chksum ( 0xffff, data, len );
uint16_t tcpip_chksum ( const void *data, size_t len ) {
return tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, data, len );
}