summaryrefslogtreecommitdiff
path: root/net
diff options
context:
space:
mode:
Diffstat (limited to 'net')
-rw-r--r--net/bootp.c885
1 files changed, 885 insertions, 0 deletions
diff --git a/net/bootp.c b/net/bootp.c
new file mode 100644
index 0000000..cbce061
--- /dev/null
+++ b/net/bootp.c
@@ -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 */
generated by cgit v1.1 at 2024-12-23 19:51:27 +0000