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u-boot/net/bootp.c

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/*
* 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)
dhcp_state_t dhcp_state = INIT;
unsigned long dhcp_leasetime;
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 */
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