2 * Based on LiMon - BOOTP.
4 * Copyright 1994, 1995, 2000 Neil Russell.
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2004 Wolfgang Denk, wd@denx.de
17 #ifdef CONFIG_STATUS_LED
18 #include <status_led.h>
20 #ifdef CONFIG_BOOTP_RANDOM_DELAY
24 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
27 * The timeout for the initial BOOTP/DHCP request used to be described by a
28 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
31 * Now that the timeout periods are variable (exponential backoff and retry)
32 * we convert the timeout count to the absolute time it would have take to
33 * execute that many retries, and keep sending retry packets until that time
36 #ifndef CONFIG_NET_RETRY_COUNT
37 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
39 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
41 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000)
43 #define PORT_BOOTPS 67 /* BOOTP server UDP port */
44 #define PORT_BOOTPC 68 /* BOOTP client UDP port */
46 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */
47 #define CONFIG_DHCP_MIN_EXT_LEN 64
50 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
54 ulong bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
55 unsigned int bootp_num_ids;
59 char net_nis_domain[32] = {0,}; /* Our NIS domain */
60 char net_hostname[32] = {0,}; /* Our hostname */
61 char net_root_path[64] = {0,}; /* Our bootpath */
63 #if defined(CONFIG_CMD_DHCP)
64 static dhcp_state_t dhcp_state = INIT;
65 static unsigned long dhcp_leasetime;
66 static struct in_addr dhcp_server_ip;
67 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
68 unsigned src, unsigned len);
72 static char *dhcpmsg2str(int type)
75 case 1: return "DHCPDISCOVER"; break;
76 case 2: return "DHCPOFFER"; break;
77 case 3: return "DHCPREQUEST"; break;
78 case 4: return "DHCPDECLINE"; break;
79 case 5: return "DHCPACK"; break;
80 case 6: return "DHCPNACK"; break;
81 case 7: return "DHCPRELEASE"; break;
82 default: return "UNKNOWN/INVALID MSG TYPE"; break;
88 static void bootp_add_id(ulong id)
90 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
91 size_t size = sizeof(bootp_ids) - sizeof(id);
93 memmove(bootp_ids, &bootp_ids[1], size);
94 bootp_ids[bootp_num_ids - 1] = id;
96 bootp_ids[bootp_num_ids] = id;
101 static bool bootp_match_id(ulong id)
105 for (i = 0; i < bootp_num_ids; i++)
106 if (bootp_ids[i] == id)
112 static int check_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len)
114 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
117 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
119 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
121 else if (bp->bp_op != OP_BOOTREQUEST &&
122 bp->bp_op != OP_BOOTREPLY &&
123 bp->bp_op != DHCP_OFFER &&
124 bp->bp_op != DHCP_ACK &&
125 bp->bp_op != DHCP_NAK)
127 else if (bp->bp_htype != HWT_ETHER)
129 else if (bp->bp_hlen != HWL_ETHER)
131 else if (!bootp_match_id(net_read_long((ulong *)&bp->bp_id)))
134 debug("Filtering pkt = %d\n", retval);
140 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
142 static void store_net_params(struct bootp_hdr *bp)
144 #if !defined(CONFIG_BOOTP_SERVERIP)
145 struct in_addr tmp_ip;
147 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
148 if (tmp_ip.s_addr != 0)
149 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
150 memcpy(net_server_ethaddr,
151 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
152 if (strlen(bp->bp_file) > 0)
153 copy_filename(net_boot_file_name, bp->bp_file,
154 sizeof(net_boot_file_name));
156 debug("net_boot_file_name: %s\n", net_boot_file_name);
158 /* Propagate to environment:
159 * don't delete exising entry when BOOTP / DHCP reply does
160 * not contain a new value
162 if (*net_boot_file_name)
163 setenv("bootfile", net_boot_file_name);
165 net_copy_ip(&net_ip, &bp->bp_yiaddr);
168 static int truncate_sz(const char *name, int maxlen, int curlen)
170 if (curlen >= maxlen) {
171 printf("*** WARNING: %s is too long (%d - max: %d)"
172 " - truncated\n", name, curlen, maxlen);
178 #if !defined(CONFIG_CMD_DHCP)
180 static void bootp_process_vendor_field(u8 *ext)
182 int size = *(ext + 1);
184 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
187 net_boot_file_expected_size_in_blocks = 0;
190 /* Fixed length fields */
191 case 1: /* Subnet mask */
192 if (net_netmask.s_addr == 0)
193 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
195 case 2: /* Time offset - Not yet supported */
197 /* Variable length fields */
198 case 3: /* Gateways list */
199 if (net_gateway.s_addr == 0)
200 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
202 case 4: /* Time server - Not yet supported */
204 case 5: /* IEN-116 name server - Not yet supported */
207 if (net_dns_server.s_addr == 0)
208 net_copy_ip(&net_dns_server,
209 (struct in_addr *)(ext + 2));
210 #if defined(CONFIG_BOOTP_DNS2)
211 if ((net_dns_server2.s_addr == 0) && (size > 4))
212 net_copy_ip(&net_dns_server2,
213 (struct in_addr *)(ext + 2 + 4));
216 case 7: /* Log server - Not yet supported */
218 case 8: /* Cookie/Quote server - Not yet supported */
220 case 9: /* LPR server - Not yet supported */
222 case 10: /* Impress server - Not yet supported */
224 case 11: /* RPL server - Not yet supported */
226 case 12: /* Host name */
227 if (net_hostname[0] == 0) {
228 size = truncate_sz("Host Name",
229 sizeof(net_hostname), size);
230 memcpy(&net_hostname, ext + 2, size);
231 net_hostname[size] = 0;
234 case 13: /* Boot file size */
236 net_boot_file_expected_size_in_blocks =
237 ntohs(*(ushort *)(ext + 2));
239 net_boot_file_expected_size_in_blocks =
240 ntohl(*(ulong *)(ext + 2));
242 case 14: /* Merit dump file - Not yet supported */
244 case 15: /* Domain name - Not yet supported */
246 case 16: /* Swap server - Not yet supported */
248 case 17: /* Root path */
249 if (net_root_path[0] == 0) {
250 size = truncate_sz("Root Path",
251 sizeof(net_root_path), size);
252 memcpy(&net_root_path, ext + 2, size);
253 net_root_path[size] = 0;
256 case 18: /* Extension path - Not yet supported */
258 * This can be used to send the information of the
259 * vendor area in another file that the client can
263 /* IP host layer fields */
264 case 40: /* NIS Domain name */
265 if (net_nis_domain[0] == 0) {
266 size = truncate_sz("NIS Domain Name",
267 sizeof(net_nis_domain), size);
268 memcpy(&net_nis_domain, ext + 2, size);
269 net_nis_domain[size] = 0;
272 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
273 case 42: /* NTP server IP */
274 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
277 /* Application layer fields */
278 case 43: /* Vendor specific info - Not yet supported */
280 * Binary information to exchange specific
281 * product information.
284 /* Reserved (custom) fields (128..254) */
288 static void bootp_process_vendor(u8 *ext, int size)
290 u8 *end = ext + size;
292 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
294 while ((ext < end) && (*ext != 0xff)) {
302 bootp_process_vendor_field(opt);
306 debug("[BOOTP] Received fields:\n");
307 if (net_netmask.s_addr)
308 debug("net_netmask : %pI4\n", &net_netmask);
310 if (net_gateway.s_addr)
311 debug("net_gateway : %pI4", &net_gateway);
313 if (net_boot_file_expected_size_in_blocks)
314 debug("net_boot_file_expected_size_in_blocks : %d\n",
315 net_boot_file_expected_size_in_blocks);
318 debug("net_hostname : %s\n", net_hostname);
320 if (net_root_path[0])
321 debug("net_root_path : %s\n", net_root_path);
323 if (net_nis_domain[0])
324 debug("net_nis_domain : %s\n", net_nis_domain);
326 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
328 debug("net_ntp_server : %pI4\n", &net_ntp_server);
333 * Handle a BOOTP received packet.
335 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
336 unsigned src, unsigned len)
338 struct bootp_hdr *bp;
340 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
341 src, dest, len, sizeof(struct bootp_hdr));
343 bp = (struct bootp_hdr *)pkt;
345 /* Filter out pkts we don't want */
346 if (check_packet(pkt, dest, src, len))
350 * Got a good BOOTP reply. Copy the data into our variables.
352 #ifdef CONFIG_STATUS_LED
353 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
356 store_net_params(bp); /* Store net parameters from reply */
358 /* Retrieve extended information (we must parse the vendor area) */
359 if (net_read_long((ulong *)&bp->bp_vend[0]) ==
360 htonl(BOOTP_VENDOR_MAGIC))
361 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
363 net_set_timeout_handler(0, (thand_f *)0);
364 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
366 debug("Got good BOOTP\n");
373 * Timeout on BOOTP/DHCP request.
375 static void bootp_timeout_handler(void)
377 ulong time_taken = get_timer(bootp_start);
379 if (time_taken >= TIMEOUT_MS) {
380 #ifdef CONFIG_BOOTP_MAY_FAIL
381 puts("\nRetry time exceeded\n");
382 net_set_state(NETLOOP_FAIL);
384 puts("\nRetry time exceeded; starting again\n");
389 if (bootp_timeout > 2000)
390 bootp_timeout = 2000;
391 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
396 #define put_vci(e, str) \
398 size_t vci_strlen = strlen(str); \
399 *e++ = 60; /* Vendor Class Identifier */ \
401 memcpy(e, str, vci_strlen); \
406 * Initialize BOOTP extension fields in the request.
408 #if defined(CONFIG_CMD_DHCP)
409 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
410 struct in_addr requested_ip)
414 #if defined(CONFIG_BOOTP_PXE)
419 #if defined(CONFIG_BOOTP_VENDOREX)
422 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
426 *e++ = 99; /* RFC1048 Magic Cookie */
431 *e++ = 53; /* DHCP Message Type */
435 *e++ = 57; /* Maximum DHCP Message Size */
437 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
438 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
440 if (server_ip.s_addr) {
441 int tmp = ntohl(server_ip.s_addr);
443 *e++ = 54; /* ServerID */
451 if (requested_ip.s_addr) {
452 int tmp = ntohl(requested_ip.s_addr);
454 *e++ = 50; /* Requested IP */
461 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
462 hostname = getenv("hostname");
464 int hostnamelen = strlen(hostname);
466 *e++ = 12; /* Hostname */
468 memcpy(e, hostname, hostnamelen);
473 #if defined(CONFIG_BOOTP_PXE)
474 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
475 *e++ = 93; /* Client System Architecture */
477 *e++ = (clientarch >> 8) & 0xff;
478 *e++ = clientarch & 0xff;
480 *e++ = 94; /* Client Network Interface Identifier */
482 *e++ = 1; /* type field for UNDI */
483 *e++ = 0; /* major revision */
484 *e++ = 0; /* minor revision */
486 uuid = getenv("pxeuuid");
489 if (uuid_str_valid(uuid)) {
490 *e++ = 97; /* Client Machine Identifier */
492 *e++ = 0; /* type 0 - UUID */
494 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
497 printf("Invalid pxeuuid: %s\n", uuid);
502 #ifdef CONFIG_BOOTP_VCI_STRING
503 put_vci(e, CONFIG_BOOTP_VCI_STRING);
506 #if defined(CONFIG_BOOTP_VENDOREX)
507 x = dhcp_vendorex_prep(e);
512 *e++ = 55; /* Parameter Request List */
513 cnt = e++; /* Pointer to count of requested items */
515 #if defined(CONFIG_BOOTP_SUBNETMASK)
516 *e++ = 1; /* Subnet Mask */
519 #if defined(CONFIG_BOOTP_TIMEOFFSET)
523 #if defined(CONFIG_BOOTP_GATEWAY)
524 *e++ = 3; /* Router Option */
527 #if defined(CONFIG_BOOTP_DNS)
528 *e++ = 6; /* DNS Server(s) */
531 #if defined(CONFIG_BOOTP_HOSTNAME)
532 *e++ = 12; /* Hostname */
535 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
536 *e++ = 13; /* Boot File Size */
539 #if defined(CONFIG_BOOTP_BOOTPATH)
540 *e++ = 17; /* Boot path */
543 #if defined(CONFIG_BOOTP_NISDOMAIN)
544 *e++ = 40; /* NIS Domain name request */
547 #if defined(CONFIG_BOOTP_NTPSERVER)
551 /* no options, so back up to avoid sending an empty request list */
555 *e++ = 255; /* End of the list */
557 /* Pad to minimal length */
558 #ifdef CONFIG_DHCP_MIN_EXT_LEN
559 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
568 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
570 static int bootp_extended(u8 *e)
574 *e++ = 99; /* RFC1048 Magic Cookie */
579 #if defined(CONFIG_CMD_DHCP)
580 *e++ = 53; /* DHCP Message Type */
582 *e++ = DHCP_DISCOVER;
584 *e++ = 57; /* Maximum DHCP Message Size */
586 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
587 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
590 #if defined(CONFIG_BOOTP_VCI_STRING) || \
591 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
592 #ifdef CONFIG_SPL_BUILD
593 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
595 put_vci(e, CONFIG_BOOTP_VCI_STRING);
599 #if defined(CONFIG_BOOTP_SUBNETMASK)
600 *e++ = 1; /* Subnet mask request */
605 #if defined(CONFIG_BOOTP_GATEWAY)
606 *e++ = 3; /* Default gateway request */
611 #if defined(CONFIG_BOOTP_DNS)
612 *e++ = 6; /* Domain Name Server */
617 #if defined(CONFIG_BOOTP_HOSTNAME)
618 *e++ = 12; /* Host name request */
623 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
624 *e++ = 13; /* Boot file size */
629 #if defined(CONFIG_BOOTP_BOOTPATH)
630 *e++ = 17; /* Boot path */
635 #if defined(CONFIG_BOOTP_NISDOMAIN)
636 *e++ = 40; /* NIS Domain name request */
640 #if defined(CONFIG_BOOTP_NTPSERVER)
646 *e++ = 255; /* End of the list */
652 void bootp_reset(void)
656 bootp_start = get_timer(0);
660 void bootp_request(void)
663 struct bootp_hdr *bp;
664 int extlen, pktlen, iplen;
666 #ifdef CONFIG_BOOTP_RANDOM_DELAY
670 struct in_addr zero_ip;
671 struct in_addr bcast_ip;
673 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
674 #if defined(CONFIG_CMD_DHCP)
678 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
682 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
683 rand_ms = rand() >> (22 - bootp_try);
684 else /* After 3rd BOOTP request max 8192 * 1ms */
685 rand_ms = rand() >> 19;
687 printf("Random delay: %ld ms...\n", rand_ms);
690 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
692 printf("BOOTP broadcast %d\n", ++bootp_try);
694 memset((void *)pkt, 0, PKTSIZE);
696 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
700 * Next line results in incorrect packet size being transmitted,
701 * resulting in errors in some DHCP servers, reporting missing bytes.
702 * Size must be set in packet header after extension length has been
704 * C. Hallinan, DS4.COM, Inc.
706 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
707 sizeof (struct bootp_hdr)); */
708 iphdr = pkt; /* We need this later for net_set_udp_header() */
709 pkt += IP_UDP_HDR_SIZE;
711 bp = (struct bootp_hdr *)pkt;
712 bp->bp_op = OP_BOOTREQUEST;
713 bp->bp_htype = HWT_ETHER;
714 bp->bp_hlen = HWL_ETHER;
716 bp->bp_secs = htons(get_timer(0) / 1000);
718 net_write_ip(&bp->bp_ciaddr, zero_ip);
719 net_write_ip(&bp->bp_yiaddr, zero_ip);
720 net_write_ip(&bp->bp_siaddr, zero_ip);
721 net_write_ip(&bp->bp_giaddr, zero_ip);
722 memcpy(bp->bp_chaddr, net_ethaddr, 6);
723 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
725 /* Request additional information from the BOOTP/DHCP server */
726 #if defined(CONFIG_CMD_DHCP)
727 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
730 extlen = bootp_extended((u8 *)bp->bp_vend);
734 * Bootp ID is the lower 4 bytes of our ethernet address
735 * plus the current time in ms.
737 bootp_id = ((ulong)net_ethaddr[2] << 24)
738 | ((ulong)net_ethaddr[3] << 16)
739 | ((ulong)net_ethaddr[4] << 8)
740 | (ulong)net_ethaddr[5];
741 bootp_id += get_timer(0);
742 bootp_id = htonl(bootp_id);
743 bootp_add_id(bootp_id);
744 net_copy_long(&bp->bp_id, &bootp_id);
747 * Calculate proper packet lengths taking into account the
748 * variable size of the options field
750 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
751 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
752 bcast_ip.s_addr = 0xFFFFFFFFL;
753 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
754 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
756 #if defined(CONFIG_CMD_DHCP)
757 dhcp_state = SELECTING;
758 net_set_udp_handler(dhcp_handler);
760 net_set_udp_handler(bootp_handler);
762 net_send_packet(net_tx_packet, pktlen);
765 #if defined(CONFIG_CMD_DHCP)
766 static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp)
768 uchar *end = popt + BOOTP_HDR_SIZE;
770 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
774 while (popt < end && *popt != 0xff) {
778 net_copy_ip(&net_netmask, (popt + 2));
780 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
781 case 2: /* Time offset */
782 to_ptr = &net_ntp_time_offset;
783 net_copy_long((ulong *)to_ptr, (ulong *)(popt + 2));
784 net_ntp_time_offset = ntohl(net_ntp_time_offset);
788 net_copy_ip(&net_gateway, (popt + 2));
791 net_copy_ip(&net_dns_server, (popt + 2));
792 #if defined(CONFIG_BOOTP_DNS2)
794 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
798 size = truncate_sz("Host Name",
799 sizeof(net_hostname), oplen);
800 memcpy(&net_hostname, popt + 2, size);
801 net_hostname[size] = 0;
803 case 15: /* Ignore Domain Name Option */
806 size = truncate_sz("Root Path",
807 sizeof(net_root_path), oplen);
808 memcpy(&net_root_path, popt + 2, size);
809 net_root_path[size] = 0;
811 case 28: /* Ignore Broadcast Address Option */
813 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
814 case 42: /* NTP server IP */
815 net_copy_ip(&net_ntp_server, (popt + 2));
819 net_copy_long(&dhcp_leasetime, (ulong *)(popt + 2));
821 case 53: /* Ignore Message Type Option */
824 net_copy_ip(&dhcp_server_ip, (popt + 2));
826 case 58: /* Ignore Renewal Time Option */
828 case 59: /* Ignore Rebinding Time Option */
830 case 66: /* Ignore TFTP server name */
832 case 67: /* vendor opt bootfile */
834 * I can't use dhcp_vendorex_proc here because I need
835 * to write into the bootp packet - even then I had to
836 * pass the bootp packet pointer into here as the
839 size = truncate_sz("Opt Boot File",
842 if (bp->bp_file[0] == '\0' && size > 0) {
844 * only use vendor boot file if we didn't
845 * receive a boot file in the main non-vendor
846 * part of the packet - god only knows why
847 * some vendors chose not to use this perfectly
848 * good spot to store the boot file (join on
849 * Tru64 Unix) it seems mind bogglingly crazy
852 printf("*** WARNING: using vendor "
853 "optional boot file\n");
854 memcpy(bp->bp_file, popt + 2, size);
855 bp->bp_file[size] = '\0';
859 #if defined(CONFIG_BOOTP_VENDOREX)
860 if (dhcp_vendorex_proc(popt))
863 printf("*** Unhandled DHCP Option in OFFER/ACK:"
867 popt += oplen + 2; /* Process next option */
871 static int dhcp_message_type(unsigned char *popt)
873 if (net_read_long((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC))
877 while (*popt != 0xff) {
878 if (*popt == 53) /* DHCP Message Type */
880 popt += *(popt + 1) + 2; /* Scan through all options */
885 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
888 struct bootp_hdr *bp;
889 int pktlen, iplen, extlen;
891 struct in_addr offered_ip;
892 struct in_addr zero_ip;
893 struct in_addr bcast_ip;
895 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
897 memset((void *)pkt, 0, PKTSIZE);
899 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
902 iphdr = pkt; /* We'll need this later to set proper pkt size */
903 pkt += IP_UDP_HDR_SIZE;
905 bp = (struct bootp_hdr *)pkt;
906 bp->bp_op = OP_BOOTREQUEST;
907 bp->bp_htype = HWT_ETHER;
908 bp->bp_hlen = HWL_ETHER;
910 bp->bp_secs = htons(get_timer(0) / 1000);
911 /* Do not set the client IP, your IP, or server IP yet, since it
912 * hasn't been ACK'ed by the server yet */
915 * RFC3046 requires Relay Agents to discard packets with
916 * nonzero and offered giaddr
919 net_write_ip(&bp->bp_giaddr, zero_ip);
921 memcpy(bp->bp_chaddr, net_ethaddr, 6);
924 * ID is the id of the OFFER packet
927 net_copy_long(&bp->bp_id, &bp_offer->bp_id);
930 * Copy options from OFFER packet if present
933 /* Copy offered IP into the parameters request list */
934 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
935 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
936 dhcp_server_ip, offered_ip);
938 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
939 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
940 bcast_ip.s_addr = 0xFFFFFFFFL;
941 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
943 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
944 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
945 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
946 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
947 net_send_packet(net_tx_packet, pktlen);
951 * Handle DHCP received packets.
953 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
954 unsigned src, unsigned len)
956 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
958 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
959 src, dest, len, dhcp_state);
961 /* Filter out pkts we don't want */
962 if (check_packet(pkt, dest, src, len))
965 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
966 "%d\n", src, dest, len, dhcp_state);
968 switch (dhcp_state) {
971 * Wait an appropriate time for any potential DHCPOFFER packets
972 * to arrive. Then select one, and generate DHCPREQUEST
973 * response. If filename is in format we recognize, assume it
974 * is a valid OFFER from a server we want.
976 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
977 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
978 if (strncmp(bp->bp_file,
979 CONFIG_SYS_BOOTFILE_PREFIX,
980 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
981 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
983 debug("TRANSITIONING TO REQUESTING STATE\n");
984 dhcp_state = REQUESTING;
986 if (net_read_long((ulong *)&bp->bp_vend[0]) ==
987 htonl(BOOTP_VENDOR_MAGIC))
988 dhcp_process_options((u8 *)&bp->bp_vend[4], bp);
990 net_set_timeout_handler(5000, bootp_timeout_handler);
991 dhcp_send_request_packet(bp);
992 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
994 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
999 debug("DHCP State: REQUESTING\n");
1001 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1002 if (net_read_long((ulong *)&bp->bp_vend[0]) ==
1003 htonl(BOOTP_VENDOR_MAGIC))
1004 dhcp_process_options((u8 *)&bp->bp_vend[4], bp);
1005 /* Store net params from reply */
1006 store_net_params(bp);
1008 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1009 &net_ip, get_timer(bootp_start));
1010 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1018 /* DHCP client bound to address */
1021 puts("DHCP: INVALID STATE\n");
1026 void dhcp_request(void)
1030 #endif /* CONFIG_CMD_DHCP */