]> git.sur5r.net Git - u-boot/commitdiff
Das U-Boot: Universal Boot Loader
authorwdenk <wdenk>
Fri, 27 Sep 2002 23:19:37 +0000 (23:19 +0000)
committerwdenk <wdenk>
Fri, 27 Sep 2002 23:19:37 +0000 (23:19 +0000)
net/bootp.c [new file with mode: 0644]

diff --git a/net/bootp.c b/net/bootp.c
new file mode 100644 (file)
index 0000000..cbce061
--- /dev/null
@@ -0,0 +1,885 @@
+/*
+ *     Based on LiMon - BOOTP.
+ *
+ *     Copyright 1994, 1995, 2000 Neil Russell.
+ *     (See License)
+ *     Copyright 2000 Roland Borde
+ *     Copyright 2000 Paolo Scaffardi
+ *     Copyright 2000-2002 Wolfgang Denk, wd@denx.de
+ */
+
+#if 0
+#define        DEBUG           1       /* general debug */
+#define DEBUG_BOOTP_EXT        1       /* Debug received vendor fields */
+#endif
+
+#ifdef DEBUG_BOOTP_EXT
+#define debug_ext(fmt,args...) printf (fmt ,##args)
+#else
+#define debug_ext(fmt,args...)
+#endif
+
+#include <common.h>
+#include <command.h>
+#include <net.h>
+#include "bootp.h"
+#include "tftp.h"
+#include "arp.h"
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#endif
+
+#define        BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+#define TIMEOUT                5               /* Seconds before trying BOOTP again    */
+#ifndef        CONFIG_NET_RETRY_COUNT
+# define TIMEOUT_COUNT 5               /* # of timeouts before giving up  */
+#else
+# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
+#endif
+
+#define PORT_BOOTPS    67              /* BOOTP server UDP port                */
+#define PORT_BOOTPC    68              /* BOOTP client UDP port                */
+
+#ifndef CONFIG_DHCP_MIN_EXT_LEN                /* minimal length of extension list     */
+#define        CONFIG_DHCP_MIN_EXT_LEN 64
+#endif
+
+ulong          BootpID;
+int            BootpTry;
+#ifdef CONFIG_BOOTP_RANDOM_DELAY
+ulong          seed1, seed2;
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+dhcp_state_t dhcp_state = INIT;
+unsigned int dhcp_leasetime = 0;
+static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
+
+/* For Debug */
+char *dhcpmsg2str(int type)
+{
+       switch (type) {
+       case 1:  return "DHCPDISCOVER"; break;
+       case 2:  return "DHCPOFFER";    break;
+       case 3:  return "DHCPREQUEST";  break;
+       case 4:  return "DHCPDECLINE";  break;
+       case 5:  return "DHCPACK";      break;
+       case 6:  return "DHCPNACK";     break;
+       case 7:  return "DHCPRELEASE";  break;
+       default: return "UNKNOWN/INVALID MSG TYPE"; break;
+       }
+}
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
+extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
+extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
+#endif
+
+#endif /* CFG_CMD_DHCP */
+
+static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
+{
+       Bootp_t *bp = (Bootp_t *) pkt;
+       int retval = 0;
+
+       if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
+               retval = -1;
+       else if (len < sizeof (Bootp_t) - OPT_SIZE)
+               retval = -2;
+       else if (bp->bp_op != OP_BOOTREQUEST &&
+           bp->bp_op != OP_BOOTREPLY &&
+           bp->bp_op != DHCP_OFFER &&
+           bp->bp_op != DHCP_ACK &&
+           bp->bp_op != DHCP_NAK ) {
+               retval = -3;
+       }
+       else if (bp->bp_htype != HWT_ETHER)
+               retval = -4;
+       else if (bp->bp_hlen != HWL_ETHER)
+               retval = -5;
+       else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
+               retval = -6;
+       }
+
+       debug ("Filtering pkt = %d\n", retval);
+
+       return retval;
+}
+
+/*
+ * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
+ */
+void BootpCopyNetParams(Bootp_t *bp)
+{
+       NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
+       NetCopyIP(&NetServerIP, &bp->bp_siaddr);
+       memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
+       copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
+
+       debug ("Bootfile: %s\n", BootFile);
+
+       /* Propagate to environment:
+         * don't delete exising entry when BOOTP / DHCP reply does
+        * not contain a new value
+        */
+       if (*BootFile) {
+               setenv ("bootfile", BootFile);
+       }
+}
+
+static int truncate_sz (const char *name, int maxlen, int curlen)
+{
+       if (curlen >= maxlen) {
+               printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
+                       name, curlen, maxlen);
+               curlen = maxlen - 1;
+       }
+       return (curlen);
+}
+
+#if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
+
+static void BootpVendorFieldProcess(u8 *ext)
+{
+    int size = *(ext+1) ;
+
+    debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, *(ext+1));
+
+    NetBootFileSize = 0;
+
+    switch (*ext) {
+    /* Fixed length fields */
+       case 1:         /* Subnet mask                                  */
+               if (NetOurSubnetMask == 0)
+                       NetCopyIP(&NetOurSubnetMask, (IPaddr_t*)(ext+2));
+               break;
+       case 2:         /* Time offset - Not yet supported              */
+               break;
+    /* Variable length fields */
+       case 3:         /* Gateways list                                */
+               if (NetOurGatewayIP == 0) {
+                       NetCopyIP(&NetOurGatewayIP, (IPaddr_t*)(ext+2));
+               }
+               break;
+       case 4:         /* Time server - Not yet supported              */
+               break;
+       case 5:         /* IEN-116 name server - Not yet supported      */
+               break;
+       case 6:
+               if (NetOurDNSIP == 0) {
+                       NetCopyIP(&NetOurDNSIP, (IPaddr_t*)(ext+2));
+               }
+               break;
+       case 7:         /* Log server - Not yet supported               */
+               break;
+       case 8:         /* Cookie/Quote server - Not yet supported      */
+               break;
+       case 9:         /* LPR server - Not yet supported               */
+               break;
+       case 10:        /* Impress server - Not yet supported           */
+               break;
+       case 11:        /* RPL server - Not yet supported               */
+               break;
+       case 12:        /* Host name                                    */
+               if (NetOurHostName[0] == 0) {
+                   size = truncate_sz("Host Name", sizeof(NetOurHostName), size);
+                   memcpy(&NetOurHostName, ext+2, size);
+                   NetOurHostName[size] = 0 ;
+               }
+               break;
+       case 13:        /* Boot file size                               */
+               if (size == 2)
+                       NetBootFileSize = ntohs(*(ushort*)(ext+2));
+               else if (size == 4)
+                       NetBootFileSize = ntohl(*(ulong*)(ext+2));
+               break;
+       case 14:        /* Merit dump file - Not yet supported          */
+               break;
+       case 15:        /* Domain name - Not yet supported              */
+               break;
+       case 16:        /* Swap server - Not yet supported              */
+               break;
+       case 17:        /* Root path                                    */
+               if (NetOurRootPath[0] == 0) {
+                   size = truncate_sz("Root Path", sizeof(NetOurRootPath), size);
+                   memcpy(&NetOurRootPath, ext+2, size);
+                   NetOurRootPath[size] = 0 ;
+               }
+               break;
+       case 18:        /* Extension path - Not yet supported           */
+               /*
+                 * This can be used to send the informations of the
+                 * vendor area in another file that the client can
+                 * access via TFTP.
+                */
+               break;
+    /* IP host layer fields */
+       case 40:        /* NIS Domain name                              */
+               if (NetOurNISDomain[0] == 0) {
+                   size = truncate_sz ("NIS Domain Name",
+                                       sizeof(NetOurNISDomain),
+                                       size);
+                   memcpy(&NetOurNISDomain, ext+2, size);
+                   NetOurNISDomain[size] = 0 ;
+               }
+               break;
+    /* Application layer fields */
+       case 43:        /* Vendor specific info - Not yet supported     */
+               /*
+                 * Binary informations to exchange specific
+                 * product information.
+                */
+               break;
+    /* Reserved (custom) fields (128..254) */
+    }
+}
+
+static void BootpVendorProcess(u8 *ext, int size)
+{
+    u8 *end = ext + size ;
+
+    debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
+
+    while ((ext < end) && (*ext != 0xff)) {
+       if (*ext == 0) {
+           ext ++ ;
+       } else {
+               u8 *opt = ext ;
+               ext += ext[1] + 2 ;
+               if (ext <= end)
+                   BootpVendorFieldProcess (opt) ;
+       }
+    }
+
+#ifdef DEBUG_BOOTP_EXT
+    printf("[BOOTP] Received fields: \n");
+    if (NetOurSubnetMask) {
+       puts ("NetOurSubnetMask : ");
+       print_IPaddr (NetOurSubnetMask);
+       putc('\n');
+    }
+
+    if (NetOurGatewayIP) {
+       puts ("NetOurGatewayIP  : ");
+       print_IPaddr (NetOurGatewayIP);
+       putc('\n');
+    }
+
+    if (NetBootFileSize) {
+       printf("NetBootFileSize : %d\n", NetBootFileSize);
+    }
+
+    if (NetOurHostName[0]) {
+       printf("NetOurHostName  : %s\n", NetOurHostName);
+    }
+
+    if (NetOurRootPath[0]) {
+       printf("NetOurRootPath  : %s\n", NetOurRootPath);
+    }
+
+    if (NetOurNISDomain[0]) {
+        printf("NetOurNISDomain : %s\n", NetOurNISDomain);
+    }
+
+    if (NetBootFileSize) {
+       printf("NetBootFileSize: %d\n", NetBootFileSize);
+    }
+#endif /* DEBUG_BOOTP_EXT */
+}
+
+/*
+ *     Handle a BOOTP received packet.
+ */
+static void
+BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+       Bootp_t *bp;
+       char    *s;
+
+       debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
+               src, dest, len, sizeof (Bootp_t));
+
+       bp = (Bootp_t *)pkt;
+
+       if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
+               return;
+
+       /*
+        *      Got a good BOOTP reply.  Copy the data into our variables.
+        */
+#ifdef CONFIG_STATUS_LED
+       status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
+#endif
+
+       BootpCopyNetParams(bp);         /* Store net parameters from reply */
+
+       /* Retrieve extended information (we must parse the vendor area) */
+       if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
+               BootpVendorProcess(&bp->bp_vend[4], len);
+
+       NetSetTimeout(0, (thand_f *)0);
+
+       debug ("Got good BOOTP\n");
+
+       if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
+               /*
+                * Just use BOOTP to configure system;
+                * Do not use TFTP to load the bootfile.
+                */
+               NetState = NETLOOP_SUCCESS;
+               return;
+       }
+
+       /* Send ARP request to get TFTP server ethernet address.
+        * This automagically starts TFTP, too.
+        */
+       ArpRequest();
+}
+#endif /* !CFG_CMD_DHCP */
+
+/*
+ *     Timeout on BOOTP/DHCP request.
+ */
+static void
+BootpTimeout(void)
+{
+       if (BootpTry >= TIMEOUT_COUNT) {
+               puts ("\nRetry count exceeded; starting again\n");
+               NetStartAgain ();
+       } else {
+               NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
+               BootpRequest ();
+       }
+}
+
+/*
+ *     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)
+{
+    u8 *start = e ;
+    u8 *cnt;
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
+    u8 *x;
+#endif
+
+    *e++ =  99;                /* RFC1048 Magic Cookie */
+    *e++ = 130;
+    *e++ =  83;
+    *e++ =  99;
+
+    *e++ = 53;         /* DHCP Message Type */
+    *e++ = 1;
+    *e++ = message_type;
+
+    *e++ = 57;         /* Maximum DHCP Message Size */
+    *e++ = 2;
+    *e++ = (576-312+OPT_SIZE) >> 8;
+    *e++ = (576-312+OPT_SIZE) & 0xff;
+
+    if ( ServerID ) {
+           int tmp = ntohl(ServerID);
+
+           *e++ = 54;  /* ServerID */
+           *e++ = 4;
+           *e++ = tmp >> 24;
+           *e++ = tmp >> 16;
+           *e++ = tmp >> 8;
+           *e++ = tmp & 0xff;
+    }
+
+    if ( RequestedIP ) {
+           int tmp = ntohl(RequestedIP);
+
+           *e++ = 50;  /* Requested IP */
+           *e++ = 4;
+           *e++ = tmp >> 24;
+           *e++ = tmp >> 16;
+           *e++ = tmp >> 8;
+           *e++ = tmp & 0xff;
+    }
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
+    if ((x = dhcp_vendorex_prep (e)))
+       return x - start ;
+#endif
+
+    *e++ = 55;         /* Parameter Request List */
+    cnt  = e++;                /* Pointer to count of requested items */
+    *cnt = 0;
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
+    *e++ = 1;          /* Subnet Mask */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
+    *e++ = 3;          /* Router Option */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
+    *e++ = 6;          /* DNS Server(s) */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
+    *e++ = 12;         /* Hostname */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
+    *e++ = 13;         /* Boot File Size */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
+    *e++ = 17;         /* Boot path */
+    *cnt += 1;
+#endif
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
+    *e++ = 40;         /* NIS Domain name request */
+    *cnt += 1;
+#endif
+    *e++ = 255;                /* End of the list */
+
+    /* Pad to minimal length */
+#ifdef CONFIG_DHCP_MIN_EXT_LEN
+    while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
+       *e++ = 0;
+#endif
+
+    return e - start ;
+}
+
+#else  /* CFG_CMD_DHCP */
+/*
+ *     Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
+ */
+static int BootpExtended (u8 *e)
+{
+    u8 *start = e ;
+
+    *e++ =  99;                /* RFC1048 Magic Cookie */
+    *e++ = 130;
+    *e++ =  83;
+    *e++ =  99;
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+    *e++ = 53;         /* DHCP Message Type */
+    *e++ = 1;
+    *e++ = DHCP_DISCOVER;
+
+    *e++ = 57;         /* Maximum DHCP Message Size */
+    *e++ = 2;
+    *e++ = (576-312+OPT_SIZE) >> 16;
+    *e++ = (576-312+OPT_SIZE) & 0xff;
+#endif /* CFG_CMD_DHCP */
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
+    *e++ =  1;         /* Subnet mask request */
+    *e++ =  4;
+     e  +=  4;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
+    *e++ =  3;         /* Default gateway request */
+    *e++ =  4;
+     e  +=  4;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
+    *e++ =  6;         /* Domain Name Server */
+    *e++ =  4;
+     e  +=  4;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
+    *e++ = 12;         /* Host name request */
+    *e++ = 32;
+     e  += 32;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
+    *e++ = 13;         /* Boot file size */
+    *e++ =  2;
+     e  +=  2;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
+    *e++ = 17;         /* Boot path */
+    *e++ = 32;
+     e  += 32;
+#endif
+
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
+    *e++ = 40;         /* NIS Domain name request */
+    *e++ = 32;
+     e  += 32;
+#endif
+
+    *e++ = 255;                /* End of the list */
+
+    return e - start ;
+}
+#endif /* CFG_CMD_DHCP */
+
+void
+BootpRequest (void)
+{
+       volatile uchar *pkt, *iphdr;
+       Bootp_t *bp;
+       int ext_len, pktlen, iplen;
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+       dhcp_state = INIT;
+#endif
+
+#ifdef CONFIG_BOOTP_RANDOM_DELAY               /* Random BOOTP delay */
+       unsigned char bi_enetaddr[6];
+       int   reg;
+       char  *e,*s;
+       uchar tmp[64];
+       ulong tst1, tst2, sum, m_mask, m_value = 0;
+
+       if (BootpTry ==0) {
+               /* get our mac */
+               reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
+               s = (reg > 0) ? tmp : NULL;
+
+               for (reg=0; reg<6; ++reg) {
+                       bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
+                       if (s) {
+                               s = (*e) ? e+1 : e;
+                       }
+               }
+#ifdef DEBUG
+               printf("BootpRequest => Our Mac: ");
+               for (reg=0; reg<6; reg++) {
+                       printf ("%x%c",
+                               bi_enetaddr[reg],
+                               reg==5 ? '\n' : ':');
+               }
+#endif /* DEBUG */
+
+               /* Mac-Manipulation 2 get seed1 */
+               tst1=0;
+               tst2=0;
+               for (reg=2; reg<6; reg++) {
+                       tst1 = tst1 << 8;
+                       tst1 = tst1 | bi_enetaddr[reg];
+               }
+               for (reg=0; reg<2; reg++) {
+                       tst2 = tst2 | bi_enetaddr[reg];
+                       tst2 = tst2 << 8;
+               }
+
+               seed1 = tst1^tst2;
+
+               /* Mirror seed1*/
+               m_mask=0x1;
+               for (reg=1;reg<=32;reg++) {
+                       m_value |= (m_mask & seed1);
+                       seed1 = seed1 >> 1;
+                       m_value = m_value << 1;
+               }
+               seed1 = m_value;
+               seed2 = 0xB78D0945;
+       }
+
+       /* Random Number Generator */
+
+       for (reg=0;reg<=0;reg++) {
+               sum = seed1 + seed2;
+               if (sum < seed1 || sum < seed2)
+                       sum++;
+               seed2 = seed1;
+               seed1 = sum;
+
+               if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
+                       sum = sum >> (22-BootpTry);
+               } else {                /*After 3rd BOOTP request max 8192 * 1ms */
+                       sum = sum >> 19;
+               }
+       }
+
+       printf ("Random delay: %ld ms...\n", sum);
+       for (reg=0; reg <sum; reg++) {
+               udelay(1000); /*Wait 1ms*/
+       }
+#endif /* CONFIG_BOOTP_RANDOM_DELAY */
+
+       printf("BOOTP broadcast %d\n", ++BootpTry);
+       pkt = NetTxPacket;
+       memset ((void*)pkt, 0, PKTSIZE);
+
+       NetSetEther(pkt, NetBcastAddr, PROT_IP);
+       pkt += ETHER_HDR_SIZE;
+
+       /*
+        * Next line results in incorrect packet size being transmitted, resulting
+        * in errors in some DHCP servers, reporting missing bytes.  Size must be
+        * set in packet header after extension length has been determined.
+        * C. Hallinan, DS4.COM, Inc.
+        */
+       /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
+       iphdr = pkt;    /* We need this later for NetSetIP() */
+       pkt += IP_HDR_SIZE;
+
+       bp = (Bootp_t *)pkt;
+       bp->bp_op = OP_BOOTREQUEST;
+       bp->bp_htype = HWT_ETHER;
+       bp->bp_hlen = HWL_ETHER;
+       bp->bp_hops = 0;
+       bp->bp_secs = htons(get_timer(0) / CFG_HZ);
+       NetWriteIP(&bp->bp_ciaddr, 0);
+       NetWriteIP(&bp->bp_yiaddr, 0);
+       NetWriteIP(&bp->bp_siaddr, 0);
+       NetWriteIP(&bp->bp_giaddr, 0);
+       memcpy (bp->bp_chaddr, NetOurEther, 6);
+       copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
+
+       /* Request additional information from the BOOTP/DHCP server */
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+       ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
+#else
+       ext_len = BootpExtended(bp->bp_vend);
+#endif /* CFG_CMD_DHCP */
+
+       /*
+        *      Bootp ID is the lower 4 bytes of our ethernet address
+        *      plus the current time in HZ.
+        */
+       BootpID = ((ulong)NetOurEther[2] << 24)
+               | ((ulong)NetOurEther[3] << 16)
+               | ((ulong)NetOurEther[4] << 8)
+               | (ulong)NetOurEther[5];
+       BootpID += get_timer(0);
+       BootpID  = htonl(BootpID);
+       NetCopyLong(&bp->bp_id, &BootpID);
+
+       /*
+        * Calculate proper packet lengths taking into account the
+        * variable size of the options field
+        */
+       pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
+       iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
+       NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
+       NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+       dhcp_state = SELECTING;
+       NetSetHandler(DhcpHandler);
+#else
+       NetSetHandler(BootpHandler);
+#endif /* CFG_CMD_DHCP */
+       NetSendPacket(NetTxPacket, pktlen);
+}
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+void DhcpOptionsProcess(char *popt)
+{
+       char *end = popt + BOOTP_HDR_SIZE;
+       int oplen, size;
+
+       while ( popt < end && *popt != 0xff ) {
+               oplen = *(popt + 1);
+               switch(*popt) {
+                       case  1:
+                               NetCopyIP(&NetOurSubnetMask, (popt+2));
+                               break;
+                       case  3:
+                               NetCopyIP(&NetOurGatewayIP, (popt+2));
+                               break;
+                       case  6:
+                               NetCopyIP(&NetOurDNSIP, (popt+2));
+                               break;
+                       case 12:
+                               size = truncate_sz ("Host Name",
+                                                   sizeof(NetOurHostName),
+                                                   oplen);
+                               memcpy(&NetOurHostName, popt+2, size);
+                               NetOurHostName[size] = 0 ;
+                               break;
+                       case 15:                /* Ignore Domain Name Option */
+                               break;
+                       case 17:
+                               size = truncate_sz ("Root Path",
+                                                   sizeof(NetOurRootPath),
+                                                   oplen);
+                               memcpy(&NetOurRootPath, popt+2, size);
+                               NetOurRootPath[size] = 0 ;
+                               break;
+                       case 51:
+                               dhcp_leasetime = *(unsigned int *)(popt + 2);
+                               break;
+                       case 53:                /* Ignore Message Type Option */
+                               break;
+                       case 54:
+                               NetCopyIP(&NetServerIP, (popt+2));
+                               break;
+                       case 58:                /* Ignore Renewal Time Option */
+                               break;
+                       case 59:                /* Ignore Rebinding Time Option */
+                               break;
+                       default:
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
+                           if (dhcp_vendorex_proc(popt))
+                               break;
+#endif
+                               printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n",
+                                       *popt);
+                               break;
+               }
+               popt += oplen + 2;      /* Process next option */
+       }
+}
+
+static int DhcpMessageType(unsigned char *popt)
+{
+       if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
+               return -1;
+
+       popt += 4;
+       while ( *popt != 0xff ) {
+               if ( *popt == 53 )      /* DHCP Message Type */
+                       return *(popt + 2);
+               popt += *(popt + 1) + 2;        /* Scan through all options */
+       }
+       return -1;
+}
+
+void DhcpSendRequestPkt(Bootp_t *bp_offer)
+{
+       volatile uchar *pkt, *iphdr;
+       Bootp_t *bp;
+       int pktlen, iplen, extlen;
+
+       debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
+       pkt = NetTxPacket;
+       memset ((void*)pkt, 0, PKTSIZE);
+
+       NetSetEther(pkt, NetBcastAddr, PROT_IP);
+       pkt += ETHER_HDR_SIZE;
+
+       iphdr = pkt;            /* We'll need this later to set proper pkt size */
+       pkt += IP_HDR_SIZE;
+
+       bp = (Bootp_t *)pkt;
+       bp->bp_op = OP_BOOTREQUEST;
+       bp->bp_htype = HWT_ETHER;
+       bp->bp_hlen = HWL_ETHER;
+       bp->bp_hops = 0;
+       bp->bp_secs = htons(get_timer(0) / CFG_HZ);
+       NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
+       NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
+       NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
+       NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
+       memcpy (bp->bp_chaddr, NetOurEther, 6);
+
+       /*
+        * ID is the id of the OFFER packet
+        */
+
+       NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
+
+       /*
+        * Copy options from OFFER packet if present
+        */
+       extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetServerIP, bp->bp_yiaddr);
+
+       pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
+       iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
+       NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
+
+       debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
+       NetSendPacket(NetTxPacket, pktlen);
+}
+
+/*
+ *     Handle DHCP received packets.
+ */
+static void
+DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+       Bootp_t *bp = (Bootp_t *)pkt;
+
+       debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
+               src, dest, len, dhcp_state);
+
+       if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
+               return;
+
+       debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
+               src, dest, len, dhcp_state);
+
+       switch (dhcp_state) {
+       case SELECTING:
+               /*
+                * Wait an appropriate time for any potential DHCPOFFER packets
+                * to arrive.  Then select one, and generate DHCPREQUEST response.
+                * If filename is in format we recognize, assume it is a valid
+                * OFFER from a server we want.
+                */
+               debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
+#ifdef CFG_BOOTFILE_PREFIX
+               if (strncmp(bp->bp_file,
+                           CFG_BOOTFILE_PREFIX,
+                           strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
+#endif /* CFG_BOOTFILE_PREFIX */
+
+                       debug ("TRANSITIONING TO REQUESTING STATE\n");
+                       dhcp_state = REQUESTING;
+#if 0
+                       if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
+                               DhcpOptionsProcess(&bp->bp_vend[4]);
+
+#endif
+                       BootpCopyNetParams(bp); /* Store net params from reply */
+
+                       NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
+                       DhcpSendRequestPkt(bp);
+#ifdef CFG_BOOTFILE_PREFIX
+               }
+#endif /* CFG_BOOTFILE_PREFIX */
+
+               return;
+               break;
+       case REQUESTING:
+               debug ("DHCP State: REQUESTING\n");
+
+               if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) {
+                       char *s;
+
+                       if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
+                               DhcpOptionsProcess(&bp->bp_vend[4]);
+                       BootpCopyNetParams(bp); /* Store net params from reply */
+                       dhcp_state = BOUND;
+                       printf("DHCP client bound to address ");
+                       print_IPaddr(NetOurIP);
+                       printf("\n");
+
+                       /* Obey the 'autoload' setting */
+                       if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
+                               NetState = NETLOOP_SUCCESS;
+                               return;
+                       }
+                       /* Send ARP request to get TFTP server ethernet address.
+                        * This automagically starts TFTP, too.
+                        */
+                       ArpRequest();
+                       return;
+               }
+               break;
+       default:
+               printf("DHCP: INVALID STATE\n");
+               break;
+       }
+
+}
+
+void DhcpRequest(void)
+{
+       BootpRequest();
+}
+#endif /* CFG_CMD_DHCP */
+
+#endif /* CFG_CMD_NET */