/* * Based on LiMon - BOOTP. * * Copyright 1994, 1995, 2000 Neil Russell. * (See License) * Copyright 2000 Roland Borde * Copyright 2000 Paolo Scaffardi * Copyright 2000-2004 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 "nfs.h" #ifdef CONFIG_STATUS_LED #include <status_led.h> #endif #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ #if defined(CONFIG_CMD_NET) #define TIMEOUT 5UL /* 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 defined(CONFIG_CMD_DHCP) dhcp_state_t dhcp_state = INIT; unsigned long dhcp_leasetime = 0; IPaddr_t NetDHCPServerIP = 0; static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len); /* For Debug */ #if 0 static 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; } } #endif #if defined(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 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 */ static void BootpCopyNetParams(Bootp_t *bp) { IPaddr_t tmp_ip; NetCopyIP(&NetOurIP, &bp->bp_yiaddr); #if !defined(CONFIG_BOOTP_SERVERIP) NetCopyIP(&tmp_ip, &bp->bp_siaddr); if (tmp_ip != 0) NetCopyIP(&NetServerIP, &bp->bp_siaddr); memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6); #endif if (strlen(bp->bp_file) > 0) 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 !defined(CONFIG_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)); } #if defined(CONFIG_BOOTP_DNS2) if ((NetOurDNS2IP == 0) && (size > 4)) { NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); } #endif 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 information 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 information 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 puts ("[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((uchar *)&bp->bp_vend[4], len); NetSetTimeout(0, (thand_f *)0); debug ("Got good BOOTP\n"); if ((s = getenv("autoload")) != NULL) { if (*s == 'n') { /* * Just use BOOTP to configure system; * Do not use TFTP to load the bootfile. */ NetState = NETLOOP_SUCCESS; return; #if defined(CONFIG_CMD_NFS) } else if (strcmp(s, "NFS") == 0) { /* * Use NFS to load the bootfile. */ NfsStart(); return; #endif } } TftpStart(); } #endif /* * 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 defined(CONFIG_CMD_DHCP) static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) { u8 *start = e; u8 *cnt; #if defined(CONFIG_BOOTP_VENDOREX) u8 *x; #endif #if defined(CONFIG_BOOTP_SEND_HOSTNAME) char *hostname; #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 defined(CONFIG_BOOTP_SEND_HOSTNAME) if ((hostname = getenv ("hostname"))) { int hostnamelen = strlen (hostname); *e++ = 12; /* Hostname */ *e++ = hostnamelen; memcpy (e, hostname, hostnamelen); e += hostnamelen; } #endif #if defined(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 defined(CONFIG_BOOTP_SUBNETMASK) *e++ = 1; /* Subnet Mask */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_TIMEOFFSET) *e++ = 2; *cnt += 1; #endif #if defined(CONFIG_BOOTP_GATEWAY) *e++ = 3; /* Router Option */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_DNS) *e++ = 6; /* DNS Server(s) */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_HOSTNAME) *e++ = 12; /* Hostname */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_BOOTFILESIZE) *e++ = 13; /* Boot File Size */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_BOOTPATH) *e++ = 17; /* Boot path */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_NISDOMAIN) *e++ = 40; /* NIS Domain name request */ *cnt += 1; #endif #if defined(CONFIG_BOOTP_NTPSERVER) *e++ = 42; *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 /* * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! */ static int BootpExtended (u8 * e) { u8 *start = e; *e++ = 99; /* RFC1048 Magic Cookie */ *e++ = 130; *e++ = 83; *e++ = 99; #if defined(CONFIG_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 #if defined(CONFIG_BOOTP_SUBNETMASK) *e++ = 1; /* Subnet mask request */ *e++ = 4; e += 4; #endif #if defined(CONFIG_BOOTP_GATEWAY) *e++ = 3; /* Default gateway request */ *e++ = 4; e += 4; #endif #if defined(CONFIG_BOOTP_DNS) *e++ = 6; /* Domain Name Server */ *e++ = 4; e += 4; #endif #if defined(CONFIG_BOOTP_HOSTNAME) *e++ = 12; /* Host name request */ *e++ = 32; e += 32; #endif #if defined(CONFIG_BOOTP_BOOTFILESIZE) *e++ = 13; /* Boot file size */ *e++ = 2; e += 2; #endif #if defined(CONFIG_BOOTP_BOOTPATH) *e++ = 17; /* Boot path */ *e++ = 32; e += 32; #endif #if defined(CONFIG_BOOTP_NISDOMAIN) *e++ = 40; /* NIS Domain name request */ *e++ = 32; e += 32; #endif *e++ = 255; /* End of the list */ return e - start; } #endif void BootpRequest (void) { volatile uchar *pkt, *iphdr; Bootp_t *bp; int ext_len, pktlen, iplen; #if defined(CONFIG_CMD_DHCP) dhcp_state = INIT; #endif #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ unsigned char bi_enetaddr[6]; int reg; char *e,*s; char 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 puts ("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); pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); /* * 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 defined(CONFIG_CMD_DHCP) ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); #else ext_len = BootpExtended((u8 *)bp->bp_vend); #endif /* * 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 defined(CONFIG_CMD_DHCP) dhcp_state = SELECTING; NetSetHandler(DhcpHandler); #else NetSetHandler(BootpHandler); #endif NetSendPacket(NetTxPacket, pktlen); } #if defined(CONFIG_CMD_DHCP) static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) { uchar *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; #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) case 2: /* Time offset */ NetCopyLong ((ulong *)&NetTimeOffset, (ulong *) (popt + 2)); NetTimeOffset = ntohl (NetTimeOffset); break; #endif case 3: NetCopyIP (&NetOurGatewayIP, (popt + 2)); break; case 6: NetCopyIP (&NetOurDNSIP, (popt + 2)); #if defined(CONFIG_BOOTP_DNS2) if (*(popt + 1) > 4) { NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); } #endif 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; #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) case 42: /* NTP server IP */ NetCopyIP (&NetNtpServerIP, (popt + 2)); break; #endif case 51: NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); break; case 53: /* Ignore Message Type Option */ break; case 54: NetCopyIP (&NetDHCPServerIP, (popt + 2)); break; case 58: /* Ignore Renewal Time Option */ break; case 59: /* Ignore Rebinding Time Option */ break; case 66: /* Ignore TFTP server name */ break; case 67: /* vendor opt bootfile */ /* * I can't use dhcp_vendorex_proc here because I need * to write into the bootp packet - even then I had to * pass the bootp packet pointer into here as the * second arg */ size = truncate_sz ("Opt Boot File", sizeof(bp->bp_file), oplen); if (bp->bp_file[0] == '\0' && size > 0) { /* * only use vendor boot file if we didn't * receive a boot file in the main non-vendor * part of the packet - god only knows why * some vendors chose not to use this perfectly * good spot to store the boot file (join on * Tru64 Unix) it seems mind bogglingly crazy * to me */ printf("*** WARNING: using vendor " "optional boot file\n"); memcpy(bp->bp_file, popt + 2, size); bp->bp_file[size] = '\0'; } break; default: #if defined(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; } static void DhcpSendRequestPkt(Bootp_t *bp_offer) { volatile uchar *pkt, *iphdr; Bootp_t *bp; int pktlen, iplen, extlen; IPaddr_t OfferedIP; debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); pkt = NetTxPacket; memset ((void*)pkt, 0, PKTSIZE); pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 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); /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by * the server yet */ /* * RFC3046 requires Relay Agents to discard packets with * nonzero and offered giaddr */ NetWriteIP(&bp->bp_giaddr, 0); 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 */ /* Copy offered IP into the parameters request list */ NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 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 (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 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((u8 *)bp->bp_vend) == DHCP_ACK ) { char *s; if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); BootpCopyNetParams(bp); /* Store net params from reply */ dhcp_state = BOUND; puts ("DHCP client bound to address "); print_IPaddr(NetOurIP); putc ('\n'); /* Obey the 'autoload' setting */ if ((s = getenv("autoload")) != NULL) { if (*s == 'n') { /* * Just use BOOTP to configure system; * Do not use TFTP to load the bootfile. */ NetState = NETLOOP_SUCCESS; return; #if defined(CONFIG_CMD_NFS) } else if (strcmp(s, "NFS") == 0) { /* * Use NFS to load the bootfile. */ NfsStart(); return; #endif } } TftpStart(); return; } break; default: puts ("DHCP: INVALID STATE\n"); break; } } void DhcpRequest(void) { BootpRequest(); } #endif /* CONFIG_CMD_DHCP */ #endif /* CONFIG_CMD_NET */