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[DHCP] Add support for ProxyDHCP requests

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The PXE spec is (as usual) unclear on precisely when ProxyDHCPREQUESTs
should be issued.  We adapt the following, slightly paranoid approach:

  If an offer contains an IP address, then it is a normal DHCPOFFER.

  If an offer contains an option #60 "PXEClient", then it is a
  ProxyDHCPOFFER.  Note that the same packet can be both a normal
  DHCPOFFER and a ProxyDHCPOFFER.

  After receiving the normal DHCPACK, if we have received a
  ProxyDHCPOFFER, we unicast a ProxyDHCPREQUEST back to the ProxyDHCP
  server on port 4011.  If we time out waiting for a ProxyDHCPACK, we
  treat this as a non-fatal error.
This commit is contained in:
Michael Brown
2008-03-27 16:31:31 +00:00
parent af466aedf1
commit aa74a7d53c
3 changed files with 567 additions and 361 deletions
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10
src/include/gpxe/dhcp.h
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@@ -24,6 +24,9 @@ struct dhcp_packet;
/** BOOTP/DHCP client port */
#define BOOTPC_PORT 68
/** ProxyDHCP server port */
#define PROXYDHCP_PORT 4011
/** Construct a tag value for an encapsulated option
*
* This tag value can be passed to Etherboot functions when searching
@@ -433,7 +436,7 @@ struct dhcphdr {
*/
#define DHCP_MIN_LEN 552
/** Maximum time that we will wait for ProxyDHCP offers */
/** Maximum time that we will wait for ProxyDHCP responses */
#define PROXYDHCP_WAIT_TIME ( TICKS_PER_SEC * 1 )
/** Settings block name used for DHCP responses */
@@ -442,12 +445,13 @@ struct dhcphdr {
/** Settings block name used for ProxyDHCP responses */
#define PROXYDHCP_SETTINGS_NAME "proxydhcp"
extern int create_dhcp_packet ( struct dhcp_packet *dhcppkt,
extern int dhcp_create_packet ( struct dhcp_packet *dhcppkt,
struct net_device *netdev, uint8_t msgtype,
struct dhcp_options *options,
void *data, size_t max_len );
extern int create_dhcp_request ( struct dhcp_packet *dhcppkt,
extern int dhcp_create_request ( struct dhcp_packet *dhcppkt,
struct net_device *netdev,
struct in_addr ciaddr,
struct dhcp_packet *dhcpoffer,
void *data, size_t max_len );
extern int start_dhcp ( struct job_interface *job, struct net_device *netdev );