diff options
| -rw-r--r-- | net/bootp.c | 885 |
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 */ |