Final PXE tweak, and release-note to reflect changes.

CHANGELOG

@@ -84,6 +84,21 @@ version 2.76
 	    Add ARM32_EFI and ARM64_EFI as valid architectures in
 	    --pxe-service.
 
+            Fix PXE booting for UEFI architectures. Modify PXE boot
+	    sequence in this case to force the client to talk to dnsmasq
+	    over port 4011. This makes PXE and especially proxy-DHCP PXE
+	    work with these archictectures.
+
+	    Workaround problems with UEFI PXE clients. There exist
+	    in the wild PXE clients which have problems with PXE
+	    boot menus. To work around this, when there's a single
+	    --pxe-service which applies to client, then that target
+	    will be booted directly, rather then sending a
+	    single-item boot menu.
+
+            Many thanks to Jarek Polok, Michael Kuron and Dreamcat4 
+	    for their work on the long-standing UEFI PXE problem.
+
 
 version 2.75
             Fix reversion on 2.74 which caused 100% CPU use when a 

src/rfc2131.c

@@ -864,6 +864,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	      if (tmp)
 		{
 		  struct dhcp_boot *boot;
+		  int redirect4011 = 0;
 
 		  if (tmp->netid.net)
 		    {
@@ -882,8 +883,13 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		  
 		  clear_packet(mess, end);
 		  
-		  /* Redirect the client to port 4011 */
+		  /* Redirect EFI clients to port 4011 */
+		  if (pxearch >= 6)
+		    {
+		      redirect4011 = 1;
 		      mess->siaddr = tmp->local;
+		    }
+		  
 		  /* Returns true if only one matching service is available. On port 4011, 
 		     it also inserts the boot file and server name. */
 		  workaround = pxe_uefi_workaround(pxearch, tagif_netid, mess, tmp->local, now, pxe);
@@ -906,7 +912,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		  option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(tmp->local.s_addr));
 		  pxe_misc(mess, end, uuid);
 		  prune_vendor_opts(tagif_netid);
-		  if (pxe && !workaround)
+		  if ((pxe && !workaround) || !redirect4011)
 		    do_encap_opts(pxe_opts(pxearch, tagif_netid, tmp->local, now), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0);
 	    
 		  log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy-ignored" : "proxy", NULL, mess->xid);