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Beginnings of DHCP protocol implementation

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This commit is contained in:
Michael Brown 2006-07-19 17:01:06 +00:00
parent a7011edfd4
commit 16fc9858db
1 changed files with 83 additions and 3 deletions
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86
src/net/udp/dhcp.c
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@ -20,6 +20,7 @@
#include <errno.h>
#include <assert.h>
#include <byteswap.h>
#include <gpxe/if_ether.h>
#include <gpxe/netdevice.h>
#include <gpxe/dhcp.h>
@ -46,6 +47,23 @@ static const uint8_t dhcp_op[] = {
[DHCPINFORM] = BOOTP_REQUEST,
};
/** Raw option data for options common to all DHCP requests */
static uint8_t dhcp_request_options_data[] = {
DHCP_MAX_MESSAGE_SIZE, DHCP_WORD ( ETH_MAX_MTU ),
DHCP_VENDOR_CLASS_ID,
DHCP_STRING ( 'E', 't', 'h', 'e', 'r', 'b', 'o', 'o', 't' ),
DHCP_PARAMETER_REQUEST_LIST,
DHCP_OPTION ( DHCP_SUBNET_MASK, DHCP_ROUTERS, DHCP_HOST_NAME ),
DHCP_END
};
/** Options common to all DHCP requests */
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 ),
};
/**
* Set option within DHCP packet
*
@ -186,9 +204,9 @@ static int set_dhcp_packet_options ( struct dhcp_packet *dhcppkt,
* dhcp_packet structure that can be passed to
* set_dhcp_packet_option() or set_dhcp_packet_options().
*/
int create_dhcp_packet ( struct dhcp_session *dhcp, uint8_t msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
static int create_dhcp_packet ( struct dhcp_session *dhcp, uint8_t msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
struct dhcphdr *dhcphdr = data;
static const uint8_t overloading = ( DHCP_OPTION_OVERLOAD_FILE |
DHCP_OPTION_OVERLOAD_SNAME );
@ -375,3 +393,65 @@ struct dhcp_option_block * dhcp_parse ( const void *data, size_t len ) {
return options;
}
/****************************************************************************
*
* DHCP to UDP interface
*
*/
static inline struct dhcp_session *
udp_to_dhcp ( struct udp_connection *conn ) {
return container_of ( conn, struct dhcp_session, udp );
}
/**
* Transmit DHCP request
*
* @v conn UDP connection
* @v buf Temporary data buffer
* @v len Length of temporary data buffer
*/
static void dhcp_senddata ( struct udp_connection *conn,
void *buf, size_t len ) {
struct dhcp_session *dhcp = udp_to_dhcp ( conn );
struct dhcp_packet dhcppkt;
int rc;
assert ( ( dhcp->state == DHCPDISCOVER ) ||
( dhcp->state == DHCPREQUEST ) );
/* Create DHCP packet in temporary buffer */
if ( ( rc = create_dhcp_packet ( dhcp, dhcp->state, buf, len,
&dhcppkt ) ) != 0 ) {
DBG ( "Could not create DHCP packet\n" );
return;
}
/* Copy in options common to all requests */
if ( ( rc = set_dhcp_packet_options ( &dhcppkt,
&dhcp_request_options ) ) != 0 ){
DBG ( "Could not set common DHCP options\n" );
return;
}
}
/**
* Receive new data
*
* @v udp UDP connection
* @v data Received data
* @v len Length of received data
*/
static void dhcp_newdata ( struct udp_connection *conn,
void *data, size_t len ) {
struct dhcp_session *dhcp = udp_to_dhcp ( conn );
}
/** DHCP UDP operations */
static struct udp_operations dhcp_udp_operations = {
.senddata = dhcp_senddata,
.newdata = dhcp_newdata,
};