/* * 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 */ #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 #ifdef CONFIG_BOOTP_RANDOM_DELAY #include "net_rand.h" #endif #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ #define TIMEOUT 5000UL /* Milliseconds 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; #if defined(CONFIG_CMD_DHCP) static dhcp_state_t dhcp_state = INIT; static unsigned long dhcp_leasetime; static IPaddr_t NetDHCPServerIP; static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 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 #endif static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) { struct Bootp_t *bp = (struct Bootp_t *) pkt; int retval = 0; if (dest != PORT_BOOTPC || src != PORT_BOOTPS) retval = -1; else if (len < sizeof(struct Bootp_t) - OPT_FIELD_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(struct Bootp_t *bp) { #if !defined(CONFIG_BOOTP_SERVERIP) IPaddr_t tmp_ip; NetCopyIP(&tmp_ip, &bp->bp_siaddr); if (tmp_ip != 0) NetCopyIP(&NetServerIP, &bp->bp_siaddr); memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6); #endif NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 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("[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; #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) case 42: /* NTP server IP */ NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); break; #endif /* 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("[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); } } debug("[BOOTP] Received fields:\n"); if (NetOurSubnetMask) debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); if (NetOurGatewayIP) debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); if (NetBootFileSize) debug("NetBootFileSize : %d\n", NetBootFileSize); if (NetOurHostName[0]) debug("NetOurHostName : %s\n", NetOurHostName); if (NetOurRootPath[0]) debug("NetOurRootPath : %s\n", NetOurRootPath); if (NetOurNISDomain[0]) debug("NetOurNISDomain : %s\n", NetOurNISDomain); if (NetBootFileSize) debug("NetBootFileSize: %d\n", NetBootFileSize); #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) if (NetNtpServerIP) debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); #endif } /* * Handle a BOOTP received packet. */ static void BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len) { struct Bootp_t *bp; debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", src, dest, len, sizeof(struct Bootp_t)); bp = (struct Bootp_t *)pkt; /* Filter out pkts we don't want */ if (BootpCheckPkt(pkt, dest, src, len)) 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); bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); debug("Got good BOOTP\n"); net_auto_load(); } #endif /* * Timeout on BOOTP/DHCP request. */ static void BootpTimeout(void) { if (BootpTry >= TIMEOUT_COUNT) { #ifdef CONFIG_BOOTP_MAY_FAIL puts("\nRetry count exceeded\n"); net_set_state(NETLOOP_FAIL); #else puts("\nRetry count exceeded; starting again\n"); NetStartAgain(); #endif } else { NetSetTimeout(TIMEOUT, BootpTimeout); BootpRequest(); } } #define put_vci(e, str) \ do { \ size_t vci_strlen = strlen(str); \ *e++ = 60; /* Vendor Class Identifier */ \ *e++ = vci_strlen; \ memcpy(e, str, vci_strlen); \ e += vci_strlen; \ } while (0) /* * 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_PXE) char *uuid; u16 clientarch; #endif #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_FIELD_SIZE) >> 8; *e++ = (576 - 312 + OPT_FIELD_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) hostname = getenv("hostname"); if (hostname) { int hostnamelen = strlen(hostname); *e++ = 12; /* Hostname */ *e++ = hostnamelen; memcpy(e, hostname, hostnamelen); e += hostnamelen; } #endif #if defined(CONFIG_BOOTP_PXE) clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; *e++ = 93; /* Client System Architecture */ *e++ = 2; *e++ = (clientarch >> 8) & 0xff; *e++ = clientarch & 0xff; *e++ = 94; /* Client Network Interface Identifier */ *e++ = 3; *e++ = 1; /* type field for UNDI */ *e++ = 0; /* major revision */ *e++ = 0; /* minor revision */ uuid = getenv("pxeuuid"); if (uuid) { if (uuid_str_valid(uuid)) { *e++ = 97; /* Client Machine Identifier */ *e++ = 17; *e++ = 0; /* type 0 - UUID */ uuid_str_to_bin(uuid, e); e += 16; } else { printf("Invalid pxeuuid: %s\n", uuid); } } #endif #ifdef CONFIG_BOOTP_VCI_STRING put_vci(e, CONFIG_BOOTP_VCI_STRING); #endif #if defined(CONFIG_BOOTP_VENDOREX) x = dhcp_vendorex_prep(e); if (x) 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 /* no options, so back up to avoid sending an empty request list */ if (*cnt == 0) e -= 2; *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_FIELD_SIZE) >> 16; *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; #endif #if defined(CONFIG_BOOTP_VCI_STRING) || \ (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)) #ifdef CONFIG_SPL_BUILD put_vci(e, CONFIG_SPL_NET_VCI_STRING); #else put_vci(e, CONFIG_BOOTP_VCI_STRING); #endif #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 #if defined(CONFIG_BOOTP_NTPSERVER) *e++ = 42; *e++ = 4; e += 4; #endif *e++ = 255; /* End of the list */ return e - start; } #endif void BootpRequest(void) { uchar *pkt, *iphdr; struct Bootp_t *bp; int extlen, pktlen, iplen; int eth_hdr_size; #ifdef CONFIG_BOOTP_RANDOM_DELAY ulong i, rand_ms; #endif bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); #if defined(CONFIG_CMD_DHCP) dhcp_state = INIT; #endif #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ if (BootpTry == 0) srand_mac(); if (BootpTry <= 2) /* Start with max 1024 * 1ms */ rand_ms = rand() >> (22 - BootpTry); else /* After 3rd BOOTP request max 8192 * 1ms */ rand_ms = rand() >> 19; printf("Random delay: %ld ms...\n", rand_ms); for (i = 0; i < rand_ms; i++) udelay(1000); /*Wait 1ms*/ #endif /* CONFIG_BOOTP_RANDOM_DELAY */ printf("BOOTP broadcast %d\n", ++BootpTry); pkt = NetTxPacket; memset((void *)pkt, 0, PKTSIZE); eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); pkt += eth_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. */ /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (struct Bootp_t)); */ iphdr = pkt; /* We need this later for net_set_udp_header() */ pkt += IP_UDP_HDR_SIZE; bp = (struct 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) / 1000); 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) extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); #else extlen = BootpExtended((u8 *)bp->bp_vend); #endif /* * Bootp ID is the lower 4 bytes of our ethernet address * plus the current time in ms. */ 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 */ iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); #if defined(CONFIG_CMD_DHCP) dhcp_state = SELECTING; net_set_udp_handler(DhcpHandler); #else net_set_udp_handler(BootpHandler); #endif NetSendPacket(NetTxPacket, pktlen); } #if defined(CONFIG_CMD_DHCP) static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp) { uchar *end = popt + BOOTP_HDR_SIZE; int oplen, size; #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) int *to_ptr; #endif 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 */ to_ptr = &NetTimeOffset; NetCopyLong((ulong *)to_ptr, (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; case 28: /* Ignore Broadcast Address Option */ 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(struct Bootp_t *bp_offer) { uchar *pkt, *iphdr; struct Bootp_t *bp; int pktlen, iplen, extlen; int eth_hdr_size; IPaddr_t OfferedIP; debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); pkt = NetTxPacket; memset((void *)pkt, 0, PKTSIZE); eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); pkt += eth_hdr_size; iphdr = pkt; /* We'll need this later to set proper pkt size */ pkt += IP_UDP_HDR_SIZE; bp = (struct 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) / 1000); /* 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); iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); NetSendPacket(NetTxPacket, pktlen); } /* * Handle DHCP received packets. */ static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len) { struct Bootp_t *bp = (struct Bootp_t *)pkt; debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", src, dest, len, dhcp_state); /* Filter out pkts we don't want */ if (BootpCheckPkt(pkt, dest, src, len)) 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 CONFIG_SYS_BOOTFILE_PREFIX if (strncmp(bp->bp_file, CONFIG_SYS_BOOTFILE_PREFIX, strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { #endif /* CONFIG_SYS_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); NetSetTimeout(TIMEOUT, BootpTimeout); DhcpSendRequestPkt(bp); #ifdef CONFIG_SYS_BOOTFILE_PREFIX } #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ return; break; case REQUESTING: debug("DHCP State: REQUESTING\n"); if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); /* Store net params from reply */ BootpCopyNetParams(bp); dhcp_state = BOUND; printf("DHCP client bound to address %pI4\n", &NetOurIP); bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); net_auto_load(); return; } break; case BOUND: /* DHCP client bound to address */ break; default: puts("DHCP: INVALID STATE\n"); break; } } void DhcpRequest(void) { BootpRequest(); } #endif /* CONFIG_CMD_DHCP */