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[dhcp] Remove redundant length fields in struct dhcp_packet

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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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src/net/dhcppkt.c
+1 -11
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@@ -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 );
}