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[dhcp] Split PXE menuing code out of dhcp.c

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The DHCP client code now implements only the mechanism of the DHCP and
PXE Boot Server protocols.  Boot Server Discovery can be initiated
manually using the "pxebs" command.  The menuing code is separated out
into a user-level function on a par with boot_root_path(), and is
entered in preference to a normal filename boot if the DHCP vendor
class is "PXEClient" and the PXE boot menu option exists.
This commit is contained in:
Michael Brown
2009-01-31 07:36:05 +00:00
parent d2b0081740
commit e65afc4b10
17 changed files with 1379 additions and 973 deletions
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80
src/net/dhcppkt.c
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@@ -32,6 +32,12 @@
*
*/
/****************************************************************************
*
* DHCP packet raw interface
*
*/
/**
* Calculate used length of an IPv4 field within a DHCP packet
*
@@ -193,21 +199,79 @@ int dhcppkt_fetch ( struct dhcp_packet *dhcppkt, unsigned int tag,
return dhcpopt_fetch ( &dhcppkt->options, tag, data, len );
}
/**
* Initialise prepopulated DHCP packet
/****************************************************************************
*
* @v dhcppkt Uninitialised DHCP packet
* @v data Memory for DHCP packet data
* @v max_len Length of memory for DHCP packet data
* DHCP packet settings interface
*
* The memory content must already be filled with valid DHCP options.
* A zeroed block counts as a block of valid DHCP options.
*/
void dhcppkt_init ( struct dhcp_packet *dhcppkt, void *data, size_t len ) {
/**
* Store value of DHCP setting
*
* @v settings Settings block
* @v setting Setting to store
* @v data Setting data, or NULL to clear setting
* @v len Length of setting data
* @ret rc Return status code
*/
static int dhcppkt_settings_store ( struct settings *settings,
struct setting *setting,
const void *data, size_t len ) {
struct dhcp_packet *dhcppkt =
container_of ( settings, struct dhcp_packet, settings );
return dhcppkt_store ( dhcppkt, setting->tag, data, len );
}
/**
* Fetch value of DHCP setting
*
* @v settings Settings block, or NULL to search all blocks
* @v setting Setting to fetch
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int dhcppkt_settings_fetch ( struct settings *settings,
struct setting *setting,
void *data, size_t len ) {
struct dhcp_packet *dhcppkt =
container_of ( settings, struct dhcp_packet, settings );
return dhcppkt_fetch ( dhcppkt, setting->tag, data, len );
}
/** DHCP settings operations */
static struct settings_operations dhcppkt_settings_operations = {
.store = dhcppkt_settings_store,
.fetch = dhcppkt_settings_fetch,
};
/****************************************************************************
*
* Constructor
*
*/
/**
* Initialise DHCP packet
*
* @v dhcppkt DHCP packet structure to fill in
* @v data DHCP packet raw data
* @v max_len Length of raw data buffer
*
* Initialise a DHCP packet structure from a data buffer containing a
* DHCP packet.
*/
void dhcppkt_init ( struct dhcp_packet *dhcppkt, struct dhcphdr *data,
size_t len ) {
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,
DHCP_SETTINGS_NAME, 0 );
}