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[dhcp] Remove redundant length fields in struct dhcp_packet 

The max_len field is never used, and the len field is used only by
dhcp_tx().  Remove these two fields, and perform the necessary trivial
calculation in dhcp_tx() instead.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-11-30 00:22:49 +00:00
parent dc462e8b3b
commit 6cee8904d1
3 changed files with 12 additions and 16 deletions
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14
src/include/ipxe/dhcppkt.h
View File

@ -22,10 +22,6 @@ struct dhcp_packet {
struct refcnt refcnt;
/** The DHCP packet contents */
struct dhcphdr *dhcphdr;
/** Maximum length of the DHCP packet buffer */
size_t max_len;
/** Used length of the DHCP packet buffer */
size_t len;
/** DHCP options */
struct dhcp_options options;
/** Settings interface */
@ -54,6 +50,16 @@ dhcppkt_put ( struct dhcp_packet *dhcppkt ) {
ref_put ( &dhcppkt->refcnt );
}
/**
* Get used length of DHCP packet
*
* @v dhcppkt DHCP packet
* @ret len Used length
*/
static inline int dhcppkt_len ( struct dhcp_packet *dhcppkt ) {
return ( offsetof ( struct dhcphdr, options ) + dhcppkt->options.len );
}
extern int dhcppkt_store ( struct dhcp_packet *dhcppkt, unsigned int tag,
const void *data, size_t len );
extern int dhcppkt_fetch ( struct dhcp_packet *dhcppkt, unsigned int tag,

12
src/net/dhcppkt.c
View File

@ -147,7 +147,6 @@ int dhcppkt_store ( struct dhcp_packet *dhcppkt, unsigned int tag,
const void *data, size_t len ) {
struct dhcp_packet_field *field;
void *field_data;
int rc;
/* If this is a special field, fill it in */
if ( ( field = find_dhcp_packet_field ( tag ) ) != NULL ) {
@ -163,13 +162,7 @@ int dhcppkt_store ( struct dhcp_packet *dhcppkt, unsigned int tag,
}
/* Otherwise, use the generic options block */
rc = dhcpopt_store ( &dhcppkt->options, tag, data, len );
/* Update our used-length field */
dhcppkt->len = ( offsetof ( struct dhcphdr, options ) +
dhcppkt->options.len );
return rc;
return dhcpopt_store ( &dhcppkt->options, tag, data, len );
}
/**
@ -273,11 +266,8 @@ void dhcppkt_init ( struct dhcp_packet *dhcppkt, struct dhcphdr *data,
size_t len ) {
ref_init ( &dhcppkt->refcnt, NULL );
dhcppkt->dhcphdr = data;
dhcppkt->max_len = len;
dhcpopt_init ( &dhcppkt->options, &dhcppkt->dhcphdr->options,
( len - offsetof ( struct dhcphdr, options ) ) );
dhcppkt->len = ( offsetof ( struct dhcphdr, options ) +
dhcppkt->options.len );
settings_init ( &dhcppkt->settings,
&dhcppkt_settings_operations, &dhcppkt->refcnt, 0 );
}

2
src/net/udp/dhcp.c
View File

@ -1122,7 +1122,7 @@ static int dhcp_tx ( struct dhcp_session *dhcp ) {
}
/* Transmit the packet */
iob_put ( iobuf, dhcppkt.len );
iob_put ( iobuf, dhcppkt_len ( &dhcppkt ) );
if ( ( rc = xfer_deliver ( &dhcp->xfer, iob_disown ( iobuf ),
&meta ) ) != 0 ) {
DBGC ( dhcp, "DHCP %p could not transmit UDP packet: %s\n",