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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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7
src/net/fakedhcp.c
View File

@@ -108,9 +108,10 @@ static int copy_settings ( struct dhcp_packet *dest,
int create_fakedhcpdiscover ( struct net_device *netdev,
void *data, size_t max_len ) {
struct dhcp_packet dhcppkt;
struct in_addr ciaddr = { 0 };
int rc;
if ( ( rc = create_dhcp_request ( &dhcppkt, netdev, NULL, data,
if ( ( rc = dhcp_create_request ( &dhcppkt, netdev, ciaddr, NULL, data,
max_len ) ) != 0 ) {
DBG ( "Could not create DHCPDISCOVER: %s\n",
strerror ( rc ) );
@@ -136,7 +137,7 @@ int create_fakedhcpack ( struct net_device *netdev,
int rc;
/* Create base DHCPACK packet */
if ( ( rc = create_dhcp_packet ( &dhcppkt, netdev, DHCPACK, NULL,
if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK, NULL,
data, max_len ) ) != 0 ) {
DBG ( "Could not create DHCPACK: %s\n", strerror ( rc ) );
return rc;
@@ -187,7 +188,7 @@ int create_fakeproxydhcpack ( struct net_device *netdev,
}
/* Create base DHCPACK packet */
if ( ( rc = create_dhcp_packet ( &dhcppkt, netdev, DHCPACK, NULL,
if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK, NULL,
data, max_len ) ) != 0 ) {
DBG ( "Could not create ProxyDHCPACK: %s\n",
strerror ( rc ) );

911
src/net/udp/dhcp.c
View File

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