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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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16
src/net/ipv6.c
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@@ -103,11 +103,9 @@ void del_ipv6_address ( struct net_device *netdev ) {
* This function constructs the pseudo header and completes the checksum in the
* upper layer header.
*/
static void ipv6_tx_csum ( struct pk_buff *pkb, struct tcpip_protocol *tcpip ) {
static uint16_t ipv6_tx_csum ( struct pk_buff *pkb, uint16_t csum ) {
struct ip6_header *ip6hdr = pkb->data;
struct ipv6_pseudo_header pshdr;
uint16_t *csum = ( ( ( void * ) ip6hdr ) + sizeof ( *ip6hdr ) +
tcpip->csum_offset );
/* Calculate pseudo header */
memset ( &pshdr, 0, sizeof ( pshdr ) );
@@ -117,7 +115,7 @@ static void ipv6_tx_csum ( struct pk_buff *pkb, struct tcpip_protocol *tcpip ) {
pshdr.nxt_hdr = ip6hdr->nxt_hdr;
/* Update checksum value */
*csum = tcpip_continue_chksum ( *csum, &pshdr, sizeof ( pshdr ) );
return tcpip_continue_chksum ( csum, &pshdr, sizeof ( pshdr ) );
}
/**
@@ -142,7 +140,8 @@ void ipv6_dump ( struct ip6_header *ip6hdr ) {
*/
static int ipv6_tx ( struct pk_buff *pkb,
struct tcpip_protocol *tcpip,
struct sockaddr_tcpip *st_dest ) {
struct sockaddr_tcpip *st_dest,
uint16_t *trans_csum ) {
struct sockaddr_in6 *dest = ( struct sockaddr_in6* ) st_dest;
struct in6_addr next_hop;
struct ipv6_miniroute *miniroute;
@@ -184,9 +183,8 @@ static int ipv6_tx ( struct pk_buff *pkb,
}
/* Complete the transport layer checksum */
if ( tcpip->csum_offset > 0 ) {
ipv6_tx_csum ( pkb, tcpip );
}
if ( trans_csum )
*trans_csum = ipv6_tx_csum ( pkb, *trans_csum );
/* Print IPv6 header */
ipv6_dump ( ip6hdr );
@@ -244,7 +242,7 @@ static int ipv6_process_nxt_hdr ( struct pk_buff *pkb, uint8_t nxt_hdr,
return 0;
}
/* Next header is not a IPv6 extension header */
return tcpip_rx ( pkb, nxt_hdr, src, dest );
return tcpip_rx ( pkb, nxt_hdr, src, dest, 0 /* fixme */ );
}
/**