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Centralise construction of the DHCP request and response packets.

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This commit is contained in:
Michael Brown
2007-07-31 03:02:21 +01:00
parent d0abffc2f6
commit 5e26df0325
4 changed files with 126 additions and 60 deletions
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141
src/net/udp/dhcp.c
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@@ -108,7 +108,7 @@ static uint32_t dhcp_xid ( struct net_device *netdev ) {
}
/** Options common to all DHCP requests */
struct dhcp_option_block dhcp_request_options = {
static struct dhcp_option_block dhcp_request_options = {
.data = dhcp_request_options_data,
.max_len = sizeof ( dhcp_request_options_data ),
.len = sizeof ( dhcp_request_options_data ),
@@ -270,8 +270,8 @@ static int copy_dhcp_packet_encap_options ( struct dhcp_packet *dhcppkt,
* @c options may specify a single options block, or be left as NULL
* in order to copy options from all registered options blocks.
*/
int copy_dhcp_packet_options ( struct dhcp_packet *dhcppkt,
struct dhcp_option_block *options ) {
static int copy_dhcp_packet_options ( struct dhcp_packet *dhcppkt,
struct dhcp_option_block *options ) {
return copy_dhcp_packet_encap_options ( dhcppkt, options, 0 );
}
@@ -289,9 +289,10 @@ int copy_dhcp_packet_options ( struct dhcp_packet *dhcppkt,
* dhcp_packet structure that can be passed to
* set_dhcp_packet_option() or copy_dhcp_packet_options().
*/
int create_dhcp_packet ( struct net_device *netdev, uint8_t msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
static int create_dhcp_packet ( struct net_device *netdev,
unsigned int msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
struct dhcphdr *dhcphdr = data;
int rc;
@@ -473,6 +474,97 @@ static struct dhcp_option_block * dhcp_parse ( const struct dhcphdr *dhcphdr,
return options;
}
/****************************************************************************
*
* Whole-packet construction
*
*/
/**
* Create DHCP request
*
* @v netdev Network device
* @v msgtype DHCP message type
* @v options DHCP server response options, or NULL
* @v data Buffer for DHCP packet
* @v max_len Size of DHCP packet buffer
* @v dhcppkt DHCP packet structure to fill in
* @ret rc Return status code
*/
int create_dhcp_request ( struct net_device *netdev, int msgtype,
struct dhcp_option_block *options,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
int rc;
/* Create DHCP packet */
if ( ( rc = create_dhcp_packet ( netdev, msgtype, data, max_len,
dhcppkt ) ) != 0 ) {
DBG ( "DHCP could not create DHCP packet: %s\n",
strerror ( rc ) );
return rc;
}
/* Copy in options common to all requests */
if ( ( rc = copy_dhcp_packet_options ( dhcppkt,
&dhcp_request_options )) !=0 ){
DBG ( "DHCP could not set common DHCP options: %s\n",
strerror ( rc ) );
return rc;
}
/* Copy any required options from previous server repsonse */
if ( options ) {
if ( ( rc = copy_dhcp_packet_option ( dhcppkt, options,
DHCP_SERVER_IDENTIFIER,
DHCP_SERVER_IDENTIFIER ) ) != 0 ) {
DBG ( "DHCP could not set server identifier "
"option: %s\n", strerror ( rc ) );
return rc;
}
if ( ( rc = copy_dhcp_packet_option ( dhcppkt, options,
DHCP_EB_YIADDR,
DHCP_REQUESTED_ADDRESS ) ) != 0 ) {
DBG ( "DHCP could not set requested address "
"option: %s\n", strerror ( rc ) );
return rc;
}
}
return 0;
}
/**
* Create DHCP response
*
* @v netdev Network device
* @v msgtype DHCP message type
* @v options DHCP options, or NULL
* @v data Buffer for DHCP packet
* @v max_len Size of DHCP packet buffer
* @v dhcppkt DHCP packet structure to fill in
* @ret rc Return status code
*/
int create_dhcp_response ( struct net_device *netdev, int msgtype,
struct dhcp_option_block *options,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
int rc;
/* Create packet and copy in options */
if ( ( rc = create_dhcp_packet ( netdev, msgtype, data, max_len,
dhcppkt ) ) != 0 ) {
DBG ( " failed to build packet" );
return rc;
}
if ( ( rc = copy_dhcp_packet_options ( dhcppkt, options ) ) != 0 ) {
DBG ( " failed to copy options" );
return rc;
}
return 0;
}
/****************************************************************************
*
* DHCP to UDP interface
@@ -556,8 +648,8 @@ static int dhcp_send_request ( struct dhcp_session *dhcp ) {
struct xfer_metadata meta = {
.netdev = dhcp->netdev,
};
struct dhcp_packet dhcppkt;
struct io_buffer *iobuf;
struct dhcp_packet dhcppkt;
int rc;
DBGC ( dhcp, "DHCP %p transmitting %s\n",
@@ -577,40 +669,15 @@ static int dhcp_send_request ( struct dhcp_session *dhcp ) {
return -ENOMEM;
/* Create DHCP packet in temporary buffer */
if ( ( rc = create_dhcp_packet ( dhcp->netdev, dhcp->state,
iobuf->data, iob_tailroom ( iobuf ),
&dhcppkt ) ) != 0 ) {
DBGC ( dhcp, "DHCP %p could not create DHCP packet: %s\n",
if ( ( rc = create_dhcp_request ( dhcp->netdev, dhcp->state,
dhcp->options, iobuf->data,
iob_tailroom ( iobuf ),
&dhcppkt ) ) != 0 ) {
DBGC ( dhcp, "DHCP %p could not construct DHCP request: %s\n",
dhcp, strerror ( rc ) );
goto done;
}
/* Copy in options common to all requests */
if ( ( rc = copy_dhcp_packet_options ( &dhcppkt,
&dhcp_request_options ) ) != 0){
DBGC ( dhcp, "DHCP %p could not set common DHCP options: %s\n",
dhcp, strerror ( rc ) );
goto done;
}
/* Copy any required options from previous server repsonse */
if ( dhcp->options ) {
if ( ( rc = copy_dhcp_packet_option ( &dhcppkt, dhcp->options,
DHCP_SERVER_IDENTIFIER,
DHCP_SERVER_IDENTIFIER ) ) != 0 ) {
DBGC ( dhcp, "DHCP %p could not set server identifier "
"option: %s\n", dhcp, strerror ( rc ) );
goto done;
}
if ( ( rc = copy_dhcp_packet_option ( &dhcppkt, dhcp->options,
DHCP_EB_YIADDR,
DHCP_REQUESTED_ADDRESS ) ) != 0 ) {
DBGC ( dhcp, "DHCP %p could not set requested address "
"option: %s\n", dhcp, strerror ( rc ) );
goto done;
}
}
/* Transmit the packet */
iob_put ( iobuf, dhcppkt.len );
rc = xfer_deliver_iob_meta ( &dhcp->xfer, iobuf, &meta );