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u-boot/net/bootp.c
Lyle Franklin c8e251f82a Adds basic support for ProxyDHCP 
- ProxyDHCP allows a second DHCP server to exist alongside your main
  DHCP server and supply additional BOOTP related options
- When u-boot sends out a DHCP request, the real DHCP server will
  respond with a normal response containing the new client IP address
  while simultaneously the ProxyDHCP server will respond with a blank
  client IP address and a `bootfile` option
- This patch adds CONFIG_SERVERIP_FROM_PROXYDHCP (default false) to
  enable this behavior and CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS
  (default 100) which tells u-boot to wait additional time after
  receiving the main DHCP response to give the ProxyDHCP response time
  to arrive
- The PXE spec for ProxyDHCP is more complicated than the solution
  added here as diagramed on page 16:
  http://www.pix.net/software/pxeboot/archive/pxespec.pdf:

```
DHCP Discover will be retried four times. The four timeouts are 4, 8, 16
and 32 seconds respectively. If a DHCPOFFER is received without an Option
timeouts in an attempt to receive a PXE response.
```

- Adding a simple delay worked for my purposes but let me know if a
  more robust solution is required

Signed-off-by: Lyle Franklin <lylejfranklin@gmail.com>
2020-12-01 10:33:37 -05:00

1137 lines
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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 <bootstage.h>
#include <command.h>
#include <env.h>
#include <efi_loader.h>
#include <log.h>
#include <net.h>
#include <rand.h>
#include <uuid.h>
#include <linux/delay.h>
#include <net/tftp.h>
#include "bootp.h"
#ifdef CONFIG_LED_STATUS
#include <status_led.h>
#endif
#ifdef CONFIG_BOOTP_RANDOM_DELAY
#include "net_rand.h"
#endif
#define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
/*
* The timeout for the initial BOOTP/DHCP request used to be described by a
* counter of fixed-length timeout periods. TIMEOUT_COUNT represents
* that counter
*
* Now that the timeout periods are variable (exponential backoff and retry)
* we convert the timeout count to the absolute time it would have take to
* execute that many retries, and keep sending retry packets until that time
* is reached.
*/
#ifndef CONFIG_NET_RETRY_COUNT
# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
#endif
#define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000)
#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
#ifndef CONFIG_BOOTP_ID_CACHE_SIZE
#define CONFIG_BOOTP_ID_CACHE_SIZE 4
#endif
u32 bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
unsigned int bootp_num_ids;
int bootp_try;
ulong bootp_start;
ulong bootp_timeout;
char net_nis_domain[32] = {0,}; /* Our NIS domain */
char net_hostname[32] = {0,}; /* Our hostname */
char net_root_path[64] = {0,}; /* Our bootpath */
static ulong time_taken_max;
#if defined(CONFIG_CMD_DHCP)
static dhcp_state_t dhcp_state = INIT;
static u32 dhcp_leasetime;
static struct in_addr dhcp_server_ip;
static u8 dhcp_option_overload;
#define OVERLOAD_FILE 1
#define OVERLOAD_SNAME 2
static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr 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 void bootp_add_id(ulong id)
{
if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
size_t size = sizeof(bootp_ids) - sizeof(id);
memmove(bootp_ids, &bootp_ids[1], size);
bootp_ids[bootp_num_ids - 1] = id;
} else {
bootp_ids[bootp_num_ids] = id;
bootp_num_ids++;
}
}
static bool bootp_match_id(ulong id)
{
unsigned int i;
for (i = 0; i < bootp_num_ids; i++)
if (bootp_ids[i] == id)
return true;
return false;
}
static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
unsigned len)
{
struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
int retval = 0;
if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
retval = -1;
else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
retval = -2;
else if (bp->bp_op != OP_BOOTREPLY)
retval = -3;
else if (bp->bp_htype != HWT_ETHER)
retval = -4;
else if (bp->bp_hlen != HWL_ETHER)
retval = -5;
else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
retval = -6;
else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
retval = -7;
debug("Filtering pkt = %d\n", retval);
return retval;
}
static void store_bootp_params(struct bootp_hdr *bp)
{
#if !defined(CONFIG_BOOTP_SERVERIP)
struct in_addr tmp_ip;
bool overwrite_serverip = true;
#if defined(CONFIG_BOOTP_PREFER_SERVERIP)
overwrite_serverip = false;
#endif
net_copy_ip(&tmp_ip, &bp->bp_siaddr);
if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr))
net_copy_ip(&net_server_ip, &bp->bp_siaddr);
memcpy(net_server_ethaddr,
((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
if (
#if defined(CONFIG_CMD_DHCP)
!(dhcp_option_overload & OVERLOAD_FILE) &&
#endif
(strlen(bp->bp_file) > 0) &&
!net_boot_file_name_explicit) {
copy_filename(net_boot_file_name, bp->bp_file,
sizeof(net_boot_file_name));
}
debug("net_boot_file_name: %s\n", net_boot_file_name);
/* Propagate to environment:
* don't delete exising entry when BOOTP / DHCP reply does
* not contain a new value
*/
if (*net_boot_file_name)
env_set("bootfile", net_boot_file_name);
#endif
}
/*
* Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
*/
static void store_net_params(struct bootp_hdr *bp)
{
#if !defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
store_bootp_params(bp);
#endif
net_copy_ip(&net_ip, &bp->bp_yiaddr);
}
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 bootp_process_vendor_field(u8 *ext)
{
int size = *(ext + 1);
debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
*(ext + 1));
net_boot_file_expected_size_in_blocks = 0;
switch (*ext) {
/* Fixed length fields */
case 1: /* Subnet mask */
if (net_netmask.s_addr == 0)
net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
break;
case 2: /* Time offset - Not yet supported */
break;
/* Variable length fields */
case 3: /* Gateways list */
if (net_gateway.s_addr == 0)
net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
break;
case 4: /* Time server - Not yet supported */
break;
case 5: /* IEN-116 name server - Not yet supported */
break;
case 6:
if (net_dns_server.s_addr == 0)
net_copy_ip(&net_dns_server,
(struct in_addr *)(ext + 2));
#if defined(CONFIG_BOOTP_DNS2)
if ((net_dns_server2.s_addr == 0) && (size > 4))
net_copy_ip(&net_dns_server2,
(struct in_addr *)(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 (net_hostname[0] == 0) {
size = truncate_sz("Host Name",
sizeof(net_hostname), size);
memcpy(&net_hostname, ext + 2, size);
net_hostname[size] = 0;
}
break;
case 13: /* Boot file size */
if (size == 2)
net_boot_file_expected_size_in_blocks =
ntohs(*(ushort *)(ext + 2));
else if (size == 4)
net_boot_file_expected_size_in_blocks =
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 (net_root_path[0] == 0) {
size = truncate_sz("Root Path",
sizeof(net_root_path), size);
memcpy(&net_root_path, ext + 2, size);
net_root_path[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 (net_nis_domain[0] == 0) {
size = truncate_sz("NIS Domain Name",
sizeof(net_nis_domain), size);
memcpy(&net_nis_domain, ext + 2, size);
net_nis_domain[size] = 0;
}
break;
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
case 42: /* NTP server IP */
net_copy_ip(&net_ntp_server, (struct in_addr *)(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 bootp_process_vendor(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)
bootp_process_vendor_field(opt);
}
}
debug("[BOOTP] Received fields:\n");
if (net_netmask.s_addr)
debug("net_netmask : %pI4\n", &net_netmask);
if (net_gateway.s_addr)
debug("net_gateway : %pI4", &net_gateway);
if (net_boot_file_expected_size_in_blocks)
debug("net_boot_file_expected_size_in_blocks : %d\n",
net_boot_file_expected_size_in_blocks);
if (net_hostname[0])
debug("net_hostname : %s\n", net_hostname);
if (net_root_path[0])
debug("net_root_path : %s\n", net_root_path);
if (net_nis_domain[0])
debug("net_nis_domain : %s\n", net_nis_domain);
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
if (net_ntp_server.s_addr)
debug("net_ntp_server : %pI4\n", &net_ntp_server);
#endif
}
/*
* Handle a BOOTP received packet.
*/
static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
unsigned src, unsigned len)
{
struct bootp_hdr *bp;
debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
src, dest, len, sizeof(struct bootp_hdr));
bp = (struct bootp_hdr *)pkt;
/* Filter out pkts we don't want */
if (check_reply_packet(pkt, dest, src, len))
return;
/*
* Got a good BOOTP reply. Copy the data into our variables.
*/
#if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
#endif
store_net_params(bp); /* Store net parameters from reply */
/* Retrieve extended information (we must parse the vendor area) */
if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
net_set_timeout_handler(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 bootp_timeout_handler(void)
{
ulong time_taken = get_timer(bootp_start);
if (time_taken >= time_taken_max) {
#ifdef CONFIG_BOOTP_MAY_FAIL
char *ethrotate;
ethrotate = env_get("ethrotate");
if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
net_restart_wrap) {
puts("\nRetry time exceeded\n");
net_set_state(NETLOOP_FAIL);
} else
#endif
{
puts("\nRetry time exceeded; starting again\n");
net_start_again();
}
} else {
bootp_timeout *= 2;
if (bootp_timeout > 2000)
bootp_timeout = 2000;
net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
bootp_request();
}
}
#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)
static u8 *add_vci(u8 *e)
{
char *vci = NULL;
char *env_vci = env_get("bootp_vci");
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
vci = CONFIG_SPL_NET_VCI_STRING;
#elif defined(CONFIG_BOOTP_VCI_STRING)
vci = CONFIG_BOOTP_VCI_STRING;
#endif
if (env_vci)
vci = env_vci;
if (vci)
put_vci(e, vci);
return e;
}
/*
* Initialize BOOTP extension fields in the request.
*/
#if defined(CONFIG_CMD_DHCP)
static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
struct in_addr requested_ip)
{
u8 *start = e;
u8 *cnt;
#ifdef CONFIG_LIB_UUID
char *uuid;
#endif
int clientarch = -1;
#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 (server_ip.s_addr) {
int tmp = ntohl(server_ip.s_addr);
*e++ = 54; /* ServerID */
*e++ = 4;
*e++ = tmp >> 24;
*e++ = tmp >> 16;
*e++ = tmp >> 8;
*e++ = tmp & 0xff;
}
if (requested_ip.s_addr) {
int tmp = ntohl(requested_ip.s_addr);
*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 = env_get("hostname");
if (hostname) {
int hostnamelen = strlen(hostname);
*e++ = 12; /* Hostname */
*e++ = hostnamelen;
memcpy(e, hostname, hostnamelen);
e += hostnamelen;
}
#endif
#ifdef CONFIG_BOOTP_PXE_CLIENTARCH
clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
#endif
if (env_get("bootp_arch"))
clientarch = env_get_ulong("bootp_arch", 16, clientarch);
if (clientarch > 0) {
*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 */
#ifdef CONFIG_LIB_UUID
uuid = env_get("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, UUID_STR_FORMAT_STD);
e += 16;
} else {
printf("Invalid pxeuuid: %s\n", uuid);
}
}
#endif
e = add_vci(e);
#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 bootp_extended(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
add_vci(e);
#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 */
/*
* If nothing in list, remove it altogether. Some DHCP servers get
* upset by this minor faux pas and do not respond at all.
*/
if (e == start + 3) {
printf("*** Warning: no DHCP options requested\n");
e -= 3;
}
return e - start;
}
#endif
void bootp_reset(void)
{
bootp_num_ids = 0;
bootp_try = 0;
bootp_start = get_timer(0);
bootp_timeout = 250;
}
void bootp_request(void)
{
uchar *pkt, *iphdr;
struct bootp_hdr *bp;
int extlen, pktlen, iplen;
int eth_hdr_size;
#ifdef CONFIG_BOOTP_RANDOM_DELAY
ulong rand_ms;
#endif
u32 bootp_id;
struct in_addr zero_ip;
struct in_addr bcast_ip;
char *ep; /* Environment pointer */
bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
#if defined(CONFIG_CMD_DHCP)
dhcp_state = INIT;
#endif
ep = env_get("bootpretryperiod");
if (ep != NULL)
time_taken_max = simple_strtoul(ep, NULL, 10);
else
time_taken_max = TIMEOUT_MS;
#ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
if (bootp_try == 0)
srand_mac();
if (bootp_try <= 2) /* Start with max 1024 * 1ms */
rand_ms = rand() >> (22 - bootp_try);
else /* After 3rd BOOTP request max 8192 * 1ms */
rand_ms = rand() >> 19;
printf("Random delay: %ld ms...\n", rand_ms);
mdelay(rand_ms);
#endif /* CONFIG_BOOTP_RANDOM_DELAY */
printf("BOOTP broadcast %d\n", ++bootp_try);
pkt = net_tx_packet;
memset((void *)pkt, 0, PKTSIZE);
eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, 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_hdr)); */
iphdr = pkt; /* We need this later for net_set_udp_header() */
pkt += IP_UDP_HDR_SIZE;
bp = (struct bootp_hdr *)pkt;
bp->bp_op = OP_BOOTREQUEST;
bp->bp_htype = HWT_ETHER;
bp->bp_hlen = HWL_ETHER;
bp->bp_hops = 0;
/*
* according to RFC1542, should be 0 on first request, secs since
* first request otherwise
*/
bp->bp_secs = htons(get_timer(bootp_start) / 1000);
zero_ip.s_addr = 0;
net_write_ip(&bp->bp_ciaddr, zero_ip);
net_write_ip(&bp->bp_yiaddr, zero_ip);
net_write_ip(&bp->bp_siaddr, zero_ip);
net_write_ip(&bp->bp_giaddr, zero_ip);
memcpy(bp->bp_chaddr, net_ethaddr, 6);
copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
/* Request additional information from the BOOTP/DHCP server */
#if defined(CONFIG_CMD_DHCP)
extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
zero_ip);
#else
extlen = bootp_extended((u8 *)bp->bp_vend);
#endif
/*
* Bootp ID is the lower 4 bytes of our ethernet address
* plus the current time in ms.
*/
bootp_id = ((u32)net_ethaddr[2] << 24)
| ((u32)net_ethaddr[3] << 16)
| ((u32)net_ethaddr[4] << 8)
| (u32)net_ethaddr[5];
bootp_id += get_timer(0);
bootp_id = htonl(bootp_id);
bootp_add_id(bootp_id);
net_copy_u32(&bp->bp_id, &bootp_id);
/*
* 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;
bcast_ip.s_addr = 0xFFFFFFFFL;
net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
#if defined(CONFIG_CMD_DHCP)
dhcp_state = SELECTING;
net_set_udp_handler(dhcp_handler);
#else
net_set_udp_handler(bootp_handler);
#endif
net_send_packet(net_tx_packet, pktlen);
}
#if defined(CONFIG_CMD_DHCP)
static void dhcp_process_options(uchar *popt, uchar *end)
{
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 0:
oplen = -1; /* Pad omits len byte */
break;
case 1:
net_copy_ip(&net_netmask, (popt + 2));
break;
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
case 2: /* Time offset */
to_ptr = &net_ntp_time_offset;
net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
net_ntp_time_offset = ntohl(net_ntp_time_offset);
break;
#endif
case 3:
net_copy_ip(&net_gateway, (popt + 2));
break;
case 6:
net_copy_ip(&net_dns_server, (popt + 2));
#if defined(CONFIG_BOOTP_DNS2)
if (*(popt + 1) > 4)
net_copy_ip(&net_dns_server2, (popt + 2 + 4));
#endif
break;
case 12:
size = truncate_sz("Host Name",
sizeof(net_hostname), oplen);
memcpy(&net_hostname, popt + 2, size);
net_hostname[size] = 0;
break;
case 15: /* Ignore Domain Name Option */
break;
case 17:
size = truncate_sz("Root Path",
sizeof(net_root_path), oplen);
memcpy(&net_root_path, popt + 2, size);
net_root_path[size] = 0;
break;
case 28: /* Ignore Broadcast Address Option */
break;
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
case 42: /* NTP server IP */
net_copy_ip(&net_ntp_server, (popt + 2));
break;
#endif
case 51:
net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
break;
case 52:
dhcp_option_overload = popt[2];
break;
case 53: /* Ignore Message Type Option */
break;
case 54:
net_copy_ip(&dhcp_server_ip, (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: /* Bootfile option */
if (!net_boot_file_name_explicit) {
size = truncate_sz("Bootfile",
sizeof(net_boot_file_name),
oplen);
memcpy(&net_boot_file_name, popt + 2, size);
net_boot_file_name[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 void dhcp_packet_process_options(struct bootp_hdr *bp)
{
uchar *popt = (uchar *)&bp->bp_vend[4];
uchar *end = popt + BOOTP_HDR_SIZE;
if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
return;
dhcp_option_overload = 0;
/*
* The 'options' field MUST be interpreted first, 'file' next,
* 'sname' last.
*/
dhcp_process_options(popt, end);
if (dhcp_option_overload & OVERLOAD_FILE) {
popt = (uchar *)bp->bp_file;
end = popt + sizeof(bp->bp_file);
dhcp_process_options(popt, end);
}
if (dhcp_option_overload & OVERLOAD_SNAME) {
popt = (uchar *)bp->bp_sname;
end = popt + sizeof(bp->bp_sname);
dhcp_process_options(popt, end);
}
}
static int dhcp_message_type(unsigned char *popt)
{
if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
return -1;
popt += 4;
while (*popt != 0xff) {
if (*popt == 53) /* DHCP Message Type */
return *(popt + 2);
if (*popt == 0) {
/* Pad */
popt += 1;
} else {
/* Scan through all options */
popt += *(popt + 1) + 2;
}
}
return -1;
}
static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
{
uchar *pkt, *iphdr;
struct bootp_hdr *bp;
int pktlen, iplen, extlen;
int eth_hdr_size;
struct in_addr offered_ip;
struct in_addr zero_ip;
struct in_addr bcast_ip;
debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
pkt = net_tx_packet;
memset((void *)pkt, 0, PKTSIZE);
eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, 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_hdr *)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(bootp_start) / 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
*/
zero_ip.s_addr = 0;
net_write_ip(&bp->bp_giaddr, zero_ip);
memcpy(bp->bp_chaddr, net_ethaddr, 6);
copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
/*
* ID is the id of the OFFER packet
*/
net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
/*
* Copy options from OFFER packet if present
*/
/* Copy offered IP into the parameters request list */
net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
dhcp_server_ip, offered_ip);
iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
bcast_ip.s_addr = 0xFFFFFFFFL;
net_set_udp_header(iphdr, bcast_ip, 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);
net_send_packet(net_tx_packet, pktlen);
}
/*
* Handle DHCP received packets.
*/
static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
unsigned src, unsigned len)
{
struct bootp_hdr *bp = (struct bootp_hdr *)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 (check_reply_packet(pkt, dest, src, len))
return;
debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
"%d\n", src, dest, len, dhcp_state);
if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) {
#if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
store_bootp_params(bp);
#endif
return;
}
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 */
dhcp_packet_process_options(bp);
efi_net_set_dhcp_ack(pkt, len);
#if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
if (!net_server_ip.s_addr)
udelay(CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS *
1000);
#endif /* CONFIG_SERVERIP_FROM_PROXYDHCP */
debug("TRANSITIONING TO REQUESTING STATE\n");
dhcp_state = REQUESTING;
net_set_timeout_handler(5000, bootp_timeout_handler);
dhcp_send_request_packet(bp);
#ifdef CONFIG_SYS_BOOTFILE_PREFIX
}
#endif /* CONFIG_SYS_BOOTFILE_PREFIX */
return;
break;
case REQUESTING:
debug("DHCP State: REQUESTING\n");
if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
dhcp_packet_process_options(bp);
/* Store net params from reply */
store_net_params(bp);
dhcp_state = BOUND;
printf("DHCP client bound to address %pI4 (%lu ms)\n",
&net_ip, get_timer(bootp_start));
net_set_timeout_handler(0, (thand_f *)0);
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 dhcp_request(void)
{
bootp_request();
}
#endif /* CONFIG_CMD_DHCP */
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