Skip to content
Snippets Groups Projects
Commit 3861aa5c authored by Wolfgang Denk's avatar Wolfgang Denk
Browse files

Initial revision

parent 2194ffd5
No related branches found
No related tags found
No related merge requests found
Hide whitespace changes
Inline Side-by-side
Showing
with 885 additions and 0 deletions
net/bootp.c 0 → 100644
+ 885
− 0
View file @ 3861aa5c
/*
* 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 */
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment