[U-Boot-Users] [PATCH] Add client id and class id to dhcp options

[Kylo Ginsberg]

This patch adds the client identifier and class identifier options to 
dhcp.  The former permits consistent address assignment from servers 
that key off the client identifier; the latter aids in debugging.

Index: net/bootp.c
===================================================================
RCS file: /cvsroot/u-boot/u-boot/net/bootp.c,v
retrieving revision 1.14
diff -u -r1.14 bootp.c
--- net/bootp.c 15 Apr 2004 21:48:49 -0000      1.14
+++ net/bootp.c 30 Mar 2005 01:14:17 -0000
@@ -378,8 +378,11 @@
  *     Initialize BOOTP extension fields in the request.
  */
 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
-static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, 
IPaddr_t RequestedIP)
+static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, 
IPaddr_t RequestedIP,
+                        char *EtherAddr)
 {
+       char *class_id = "U-boot";
+       int len;
        u8 *start = e;
        u8 *cnt;

@@ -404,6 +407,23 @@
        *e++ = (576 - 312 + OPT_SIZE) >> 8;
        *e++ = (576 - 312 + OPT_SIZE) & 0xff;

+       *e++ = 61;              /* Client Identifier, use the MAC */
+       *e++ = 7;
+       *e++ = 1;
+       *e++ = EtherAddr[0];
+       *e++ = EtherAddr[1];
+       *e++ = EtherAddr[2];
+       *e++ = EtherAddr[3];
+       *e++ = EtherAddr[4];
+       *e++ = EtherAddr[5];
+
+       *e++ = 60;              /* Class Identifier */
+       len = strlen(class_id);
+       *e++ = len;
+       /* don't use strcpy, we don't want the terminating 0 */
+       memcpy(e, class_id, len);
+       e += len;
+
        if (ServerID) {
                int tmp = ntohl (ServerID);

@@ -671,7 +691,7 @@

        /* Request additional information from the BOOTP/DHCP server */
 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
-       ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
+       ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0, 
NetOurEther);
 #else
        ext_len = BootpExtended(bp->bp_vend);
 #endif /* CFG_CMD_DHCP */
@@ -817,7 +837,7 @@
         * Copy options from OFFER packet if present
         */
        NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
-       extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, 
NetDHCPServerIP, OfferedIP);
+       extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, 
NetDHCPServerIP, OfferedIP, NetOurEther);

        pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
        iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;