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
12 #include <bootstage.h>
15 #include <efi_loader.h>
20 #include <linux/delay.h>
23 #ifdef CONFIG_LED_STATUS
24 #include <status_led.h>
26 #ifdef CONFIG_BOOTP_RANDOM_DELAY
30 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
33 * The timeout for the initial BOOTP/DHCP request used to be described by a
34 * counter of fixed-length timeout periods. CONFIG_NET_RETRY_COUNT represents
37 * Now that the timeout periods are variable (exponential backoff and retry)
38 * we convert the timeout count to the absolute time it would have take to
39 * execute that many retries, and keep sending retry packets until that time
42 #define TIMEOUT_MS ((3 + (CONFIG_NET_RETRY_COUNT * 5)) * 1000)
44 #ifndef CFG_DHCP_MIN_EXT_LEN /* minimal length of extension list */
45 #define CFG_DHCP_MIN_EXT_LEN 64
48 #ifndef CFG_BOOTP_ID_CACHE_SIZE
49 #define CFG_BOOTP_ID_CACHE_SIZE 4
52 u32 bootp_ids[CFG_BOOTP_ID_CACHE_SIZE];
53 unsigned int bootp_num_ids;
57 char net_nis_domain[32] = {0,}; /* Our NIS domain */
58 char net_hostname[32] = {0,}; /* Our hostname */
59 char net_root_path[CONFIG_BOOTP_MAX_ROOT_PATH_LEN] = {0,}; /* Our bootpath */
61 static ulong time_taken_max;
63 #if defined(CONFIG_CMD_DHCP)
64 static dhcp_state_t dhcp_state = INIT;
65 static u32 dhcp_leasetime;
66 static struct in_addr dhcp_server_ip;
67 static u8 dhcp_option_overload;
68 #define OVERLOAD_FILE 1
69 #define OVERLOAD_SNAME 2
70 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
71 unsigned src, unsigned len);
75 static char *dhcpmsg2str(int type)
78 case 1: return "DHCPDISCOVER"; break;
79 case 2: return "DHCPOFFER"; break;
80 case 3: return "DHCPREQUEST"; break;
81 case 4: return "DHCPDECLINE"; break;
82 case 5: return "DHCPACK"; break;
83 case 6: return "DHCPNACK"; break;
84 case 7: return "DHCPRELEASE"; break;
85 default: return "UNKNOWN/INVALID MSG TYPE"; break;
91 static void bootp_add_id(ulong id)
93 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
94 size_t size = sizeof(bootp_ids) - sizeof(id);
96 memmove(bootp_ids, &bootp_ids[1], size);
97 bootp_ids[bootp_num_ids - 1] = id;
99 bootp_ids[bootp_num_ids] = id;
104 static bool bootp_match_id(ulong id)
108 for (i = 0; i < bootp_num_ids; i++)
109 if (bootp_ids[i] == id)
115 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
118 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
121 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
123 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
125 else if (bp->bp_op != OP_BOOTREPLY)
127 else if (bp->bp_htype != HWT_ETHER)
129 else if (bp->bp_hlen != HWL_ETHER)
131 else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
133 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
136 debug("Filtering pkt = %d\n", retval);
141 static void store_bootp_params(struct bootp_hdr *bp)
143 struct in_addr tmp_ip;
144 bool overwrite_serverip = true;
146 if (IS_ENABLED(CONFIG_BOOTP_SERVERIP))
149 #if defined(CONFIG_BOOTP_PREFER_SERVERIP)
150 overwrite_serverip = false;
153 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
154 if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr))
155 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
156 memcpy(net_server_ethaddr,
157 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
159 #if defined(CONFIG_CMD_DHCP)
160 !(dhcp_option_overload & OVERLOAD_FILE) &&
162 (strlen(bp->bp_file) > 0) &&
163 !net_boot_file_name_explicit) {
164 copy_filename(net_boot_file_name, bp->bp_file,
165 sizeof(net_boot_file_name));
168 debug("net_boot_file_name: %s\n", net_boot_file_name);
170 /* Propagate to environment:
171 * don't delete exising entry when BOOTP / DHCP reply does
172 * not contain a new value
174 if (*net_boot_file_name)
175 env_set("bootfile", net_boot_file_name);
179 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
181 static void store_net_params(struct bootp_hdr *bp)
183 #if !defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
184 store_bootp_params(bp);
186 net_copy_ip(&net_ip, &bp->bp_yiaddr);
189 static int truncate_sz(const char *name, int maxlen, int curlen)
191 if (curlen >= maxlen) {
192 printf("*** WARNING: %s is too long (%d - max: %d)"
193 " - truncated\n", name, curlen, maxlen);
199 #if !defined(CONFIG_CMD_DHCP)
201 static void bootp_process_vendor_field(u8 *ext)
203 int size = *(ext + 1);
205 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
208 net_boot_file_expected_size_in_blocks = 0;
211 /* Fixed length fields */
212 case 1: /* Subnet mask */
213 if (net_netmask.s_addr == 0)
214 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
216 case 2: /* Time offset - Not yet supported */
218 /* Variable length fields */
219 case 3: /* Gateways list */
220 if (net_gateway.s_addr == 0)
221 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
223 case 4: /* Time server - Not yet supported */
225 case 5: /* IEN-116 name server - Not yet supported */
228 if (net_dns_server.s_addr == 0)
229 net_copy_ip(&net_dns_server,
230 (struct in_addr *)(ext + 2));
231 #if defined(CONFIG_BOOTP_DNS2)
232 if ((net_dns_server2.s_addr == 0) && (size > 4))
233 net_copy_ip(&net_dns_server2,
234 (struct in_addr *)(ext + 2 + 4));
237 case 7: /* Log server - Not yet supported */
239 case 8: /* Cookie/Quote server - Not yet supported */
241 case 9: /* LPR server - Not yet supported */
243 case 10: /* Impress server - Not yet supported */
245 case 11: /* RPL server - Not yet supported */
247 case 12: /* Host name */
248 if (net_hostname[0] == 0) {
249 size = truncate_sz("Host Name",
250 sizeof(net_hostname), size);
251 memcpy(&net_hostname, ext + 2, size);
252 net_hostname[size] = 0;
255 case 13: /* Boot file size */
257 net_boot_file_expected_size_in_blocks =
258 ntohs(*(ushort *)(ext + 2));
260 net_boot_file_expected_size_in_blocks =
261 ntohl(*(ulong *)(ext + 2));
263 case 14: /* Merit dump file - Not yet supported */
265 case 15: /* Domain name - Not yet supported */
267 case 16: /* Swap server - Not yet supported */
269 case 17: /* Root path */
270 if (net_root_path[0] == 0) {
271 size = truncate_sz("Root Path",
272 sizeof(net_root_path), size);
273 memcpy(&net_root_path, ext + 2, size);
274 net_root_path[size] = 0;
277 case 18: /* Extension path - Not yet supported */
279 * This can be used to send the information of the
280 * vendor area in another file that the client can
284 /* IP host layer fields */
285 case 40: /* NIS Domain name */
286 if (net_nis_domain[0] == 0) {
287 size = truncate_sz("NIS Domain Name",
288 sizeof(net_nis_domain), size);
289 memcpy(&net_nis_domain, ext + 2, size);
290 net_nis_domain[size] = 0;
293 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
294 case 42: /* NTP server IP */
295 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
298 /* Application layer fields */
299 case 43: /* Vendor specific info - Not yet supported */
301 * Binary information to exchange specific
302 * product information.
305 /* Reserved (custom) fields (128..254) */
309 static void bootp_process_vendor(u8 *ext, int size)
311 u8 *end = ext + size;
313 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
315 while ((ext < end) && (*ext != 0xff)) {
323 bootp_process_vendor_field(opt);
327 debug("[BOOTP] Received fields:\n");
328 if (net_netmask.s_addr)
329 debug("net_netmask : %pI4\n", &net_netmask);
331 if (net_gateway.s_addr)
332 debug("net_gateway : %pI4", &net_gateway);
334 if (net_boot_file_expected_size_in_blocks)
335 debug("net_boot_file_expected_size_in_blocks : %d\n",
336 net_boot_file_expected_size_in_blocks);
339 debug("net_hostname : %s\n", net_hostname);
341 if (net_root_path[0])
342 debug("net_root_path : %s\n", net_root_path);
344 if (net_nis_domain[0])
345 debug("net_nis_domain : %s\n", net_nis_domain);
347 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
348 if (net_ntp_server.s_addr)
349 debug("net_ntp_server : %pI4\n", &net_ntp_server);
354 * Handle a BOOTP received packet.
356 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
357 unsigned src, unsigned len)
359 struct bootp_hdr *bp;
361 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
362 src, dest, len, sizeof(struct bootp_hdr));
364 bp = (struct bootp_hdr *)pkt;
366 /* Filter out pkts we don't want */
367 if (check_reply_packet(pkt, dest, src, len))
371 * Got a good BOOTP reply. Copy the data into our variables.
373 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
374 status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
377 store_net_params(bp); /* Store net parameters from reply */
379 /* Retrieve extended information (we must parse the vendor area) */
380 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
381 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
383 net_set_timeout_handler(0, (thand_f *)0);
384 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
386 debug("Got good BOOTP\n");
393 * Timeout on BOOTP/DHCP request.
395 static void bootp_timeout_handler(void)
397 ulong time_taken = get_timer(bootp_start);
399 if (time_taken >= time_taken_max) {
400 #ifdef CONFIG_BOOTP_MAY_FAIL
403 ethrotate = env_get("ethrotate");
404 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
406 puts("\nRetry time exceeded\n");
407 net_set_state(NETLOOP_FAIL);
411 puts("\nRetry time exceeded; starting again\n");
416 if (bootp_timeout > 2000)
417 bootp_timeout = 2000;
418 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
423 #define put_vci(e, str) \
425 size_t vci_strlen = strlen(str); \
426 *e++ = 60; /* Vendor Class Identifier */ \
428 memcpy(e, str, vci_strlen); \
432 static u8 *add_vci(u8 *e)
435 char *env_vci = env_get("bootp_vci");
437 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
438 vci = CONFIG_SPL_NET_VCI_STRING;
439 #elif defined(CONFIG_BOOTP_VCI_STRING)
440 vci = CONFIG_BOOTP_VCI_STRING;
453 * Initialize BOOTP extension fields in the request.
455 #if defined(CONFIG_CMD_DHCP)
456 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
457 struct in_addr requested_ip)
461 #ifdef CONFIG_LIB_UUID
466 #if defined(CONFIG_BOOTP_VENDOREX)
469 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
473 *e++ = 99; /* RFC1048 Magic Cookie */
478 *e++ = 53; /* DHCP Message Type */
482 *e++ = 57; /* Maximum DHCP Message Size */
484 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
485 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
487 if (server_ip.s_addr) {
488 int tmp = ntohl(server_ip.s_addr);
490 *e++ = 54; /* ServerID */
498 if (requested_ip.s_addr) {
499 int tmp = ntohl(requested_ip.s_addr);
501 *e++ = 50; /* Requested IP */
508 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
509 hostname = env_get("hostname");
511 int hostnamelen = strlen(hostname);
513 *e++ = 12; /* Hostname */
515 memcpy(e, hostname, hostnamelen);
520 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
521 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
524 if (env_get("bootp_arch"))
525 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
527 if (clientarch > 0) {
528 *e++ = 93; /* Client System Architecture */
530 *e++ = (clientarch >> 8) & 0xff;
531 *e++ = clientarch & 0xff;
534 *e++ = 94; /* Client Network Interface Identifier */
536 *e++ = 1; /* type field for UNDI */
537 *e++ = 0; /* major revision */
538 *e++ = 0; /* minor revision */
540 #ifdef CONFIG_LIB_UUID
541 uuid = env_get("pxeuuid");
544 if (uuid_str_valid(uuid)) {
545 *e++ = 97; /* Client Machine Identifier */
547 *e++ = 0; /* type 0 - UUID */
549 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
552 printf("Invalid pxeuuid: %s\n", uuid);
559 #if defined(CONFIG_BOOTP_VENDOREX)
560 x = dhcp_vendorex_prep(e);
565 *e++ = 55; /* Parameter Request List */
566 cnt = e++; /* Pointer to count of requested items */
568 #if defined(CONFIG_BOOTP_SUBNETMASK)
569 *e++ = 1; /* Subnet Mask */
572 #if defined(CONFIG_BOOTP_TIMEOFFSET)
576 #if defined(CONFIG_BOOTP_GATEWAY)
577 *e++ = 3; /* Router Option */
580 #if defined(CONFIG_BOOTP_DNS)
581 *e++ = 6; /* DNS Server(s) */
584 #if defined(CONFIG_BOOTP_HOSTNAME)
585 *e++ = 12; /* Hostname */
588 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
589 *e++ = 13; /* Boot File Size */
592 #if defined(CONFIG_BOOTP_BOOTPATH)
593 *e++ = 17; /* Boot path */
596 #if defined(CONFIG_BOOTP_NISDOMAIN)
597 *e++ = 40; /* NIS Domain name request */
600 #if defined(CONFIG_BOOTP_NTPSERVER)
604 /* no options, so back up to avoid sending an empty request list */
608 *e++ = 255; /* End of the list */
610 /* Pad to minimal length */
611 #ifdef CFG_DHCP_MIN_EXT_LEN
612 while ((e - start) < CFG_DHCP_MIN_EXT_LEN)
621 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
623 static int bootp_extended(u8 *e)
627 *e++ = 99; /* RFC1048 Magic Cookie */
632 #if defined(CONFIG_CMD_DHCP)
633 *e++ = 53; /* DHCP Message Type */
635 *e++ = DHCP_DISCOVER;
637 *e++ = 57; /* Maximum DHCP Message Size */
639 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
640 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
645 #if defined(CONFIG_BOOTP_SUBNETMASK)
646 *e++ = 1; /* Subnet mask request */
651 #if defined(CONFIG_BOOTP_GATEWAY)
652 *e++ = 3; /* Default gateway request */
657 #if defined(CONFIG_BOOTP_DNS)
658 *e++ = 6; /* Domain Name Server */
663 #if defined(CONFIG_BOOTP_HOSTNAME)
664 *e++ = 12; /* Host name request */
669 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
670 *e++ = 13; /* Boot file size */
675 #if defined(CONFIG_BOOTP_BOOTPATH)
676 *e++ = 17; /* Boot path */
681 #if defined(CONFIG_BOOTP_NISDOMAIN)
682 *e++ = 40; /* NIS Domain name request */
686 #if defined(CONFIG_BOOTP_NTPSERVER)
692 *e++ = 255; /* End of the list */
695 * If nothing in list, remove it altogether. Some DHCP servers get
696 * upset by this minor faux pas and do not respond at all.
698 if (e == start + 3) {
699 printf("*** Warning: no DHCP options requested\n");
707 void bootp_reset(void)
711 bootp_start = get_timer(0);
715 void bootp_request(void)
718 struct bootp_hdr *bp;
719 int extlen, pktlen, iplen;
721 #ifdef CONFIG_BOOTP_RANDOM_DELAY
725 struct in_addr zero_ip;
726 struct in_addr bcast_ip;
727 char *ep; /* Environment pointer */
729 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
730 #if defined(CONFIG_CMD_DHCP)
734 ep = env_get("bootpretryperiod");
736 time_taken_max = dectoul(ep, NULL);
738 time_taken_max = TIMEOUT_MS;
740 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
744 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
745 rand_ms = rand() >> (22 - bootp_try);
746 else /* After 3rd BOOTP request max 8192 * 1ms */
747 rand_ms = rand() >> 19;
749 printf("Random delay: %ld ms...\n", rand_ms);
752 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
754 printf("BOOTP broadcast %d\n", ++bootp_try);
756 memset((void *)pkt, 0, PKTSIZE);
758 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
762 * Next line results in incorrect packet size being transmitted,
763 * resulting in errors in some DHCP servers, reporting missing bytes.
764 * Size must be set in packet header after extension length has been
766 * C. Hallinan, DS4.COM, Inc.
768 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
769 sizeof (struct bootp_hdr)); */
770 iphdr = pkt; /* We need this later for net_set_udp_header() */
771 pkt += IP_UDP_HDR_SIZE;
773 bp = (struct bootp_hdr *)pkt;
774 bp->bp_op = OP_BOOTREQUEST;
775 bp->bp_htype = HWT_ETHER;
776 bp->bp_hlen = HWL_ETHER;
779 * according to RFC1542, should be 0 on first request, secs since
780 * first request otherwise
782 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
784 net_write_ip(&bp->bp_ciaddr, zero_ip);
785 net_write_ip(&bp->bp_yiaddr, zero_ip);
786 net_write_ip(&bp->bp_siaddr, zero_ip);
787 net_write_ip(&bp->bp_giaddr, zero_ip);
788 memcpy(bp->bp_chaddr, net_ethaddr, 6);
789 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
791 /* Request additional information from the BOOTP/DHCP server */
792 #if defined(CONFIG_CMD_DHCP)
793 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
796 extlen = bootp_extended((u8 *)bp->bp_vend);
800 * Bootp ID is the lower 4 bytes of our ethernet address
801 * plus the current time in ms.
803 bootp_id = ((u32)net_ethaddr[2] << 24)
804 | ((u32)net_ethaddr[3] << 16)
805 | ((u32)net_ethaddr[4] << 8)
806 | (u32)net_ethaddr[5];
807 bootp_id += get_timer(0);
808 bootp_id = htonl(bootp_id);
809 bootp_add_id(bootp_id);
810 net_copy_u32(&bp->bp_id, &bootp_id);
813 * Calculate proper packet lengths taking into account the
814 * variable size of the options field
816 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
817 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
818 bcast_ip.s_addr = 0xFFFFFFFFL;
819 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
820 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
822 #if defined(CONFIG_CMD_DHCP)
823 dhcp_state = SELECTING;
824 net_set_udp_handler(dhcp_handler);
826 net_set_udp_handler(bootp_handler);
828 net_send_packet(net_tx_packet, pktlen);
831 #if defined(CONFIG_CMD_DHCP)
832 static void dhcp_process_options(uchar *popt, uchar *end)
835 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
839 while (popt < end && *popt != 0xff) {
843 oplen = -1; /* Pad omits len byte */
846 net_copy_ip(&net_netmask, (popt + 2));
848 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
849 case 2: /* Time offset */
850 to_ptr = &net_ntp_time_offset;
851 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
852 net_ntp_time_offset = ntohl(net_ntp_time_offset);
856 net_copy_ip(&net_gateway, (popt + 2));
859 net_copy_ip(&net_dns_server, (popt + 2));
860 #if defined(CONFIG_BOOTP_DNS2)
862 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
866 size = truncate_sz("Host Name",
867 sizeof(net_hostname), oplen);
868 memcpy(&net_hostname, popt + 2, size);
869 net_hostname[size] = 0;
871 case 15: /* Ignore Domain Name Option */
874 size = truncate_sz("Root Path",
875 sizeof(net_root_path), oplen);
876 memcpy(&net_root_path, popt + 2, size);
877 net_root_path[size] = 0;
879 case 28: /* Ignore Broadcast Address Option */
881 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
882 case 42: /* NTP server IP */
883 net_copy_ip(&net_ntp_server, (popt + 2));
887 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
890 dhcp_option_overload = popt[2];
892 case 53: /* Ignore Message Type Option */
895 net_copy_ip(&dhcp_server_ip, (popt + 2));
897 case 58: /* Ignore Renewal Time Option */
899 case 59: /* Ignore Rebinding Time Option */
901 case 66: /* Ignore TFTP server name */
903 case 67: /* Bootfile option */
904 if (!net_boot_file_name_explicit) {
905 size = truncate_sz("Bootfile",
906 sizeof(net_boot_file_name),
908 memcpy(&net_boot_file_name, popt + 2, size);
909 net_boot_file_name[size] = 0;
913 #if defined(CONFIG_BOOTP_VENDOREX)
914 if (dhcp_vendorex_proc(popt))
917 printf("*** Unhandled DHCP Option in OFFER/ACK:"
921 popt += oplen + 2; /* Process next option */
925 static void dhcp_packet_process_options(struct bootp_hdr *bp)
927 uchar *popt = (uchar *)&bp->bp_vend[4];
928 uchar *end = popt + BOOTP_HDR_SIZE;
930 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
933 dhcp_option_overload = 0;
936 * The 'options' field MUST be interpreted first, 'file' next,
939 dhcp_process_options(popt, end);
941 if (dhcp_option_overload & OVERLOAD_FILE) {
942 popt = (uchar *)bp->bp_file;
943 end = popt + sizeof(bp->bp_file);
944 dhcp_process_options(popt, end);
947 if (dhcp_option_overload & OVERLOAD_SNAME) {
948 popt = (uchar *)bp->bp_sname;
949 end = popt + sizeof(bp->bp_sname);
950 dhcp_process_options(popt, end);
954 static int dhcp_message_type(unsigned char *popt)
956 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
960 while (*popt != 0xff) {
961 if (*popt == 53) /* DHCP Message Type */
967 /* Scan through all options */
968 popt += *(popt + 1) + 2;
974 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
977 struct bootp_hdr *bp;
978 int pktlen, iplen, extlen;
980 struct in_addr offered_ip;
981 struct in_addr zero_ip;
982 struct in_addr bcast_ip;
984 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
986 memset((void *)pkt, 0, PKTSIZE);
988 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
991 iphdr = pkt; /* We'll need this later to set proper pkt size */
992 pkt += IP_UDP_HDR_SIZE;
994 bp = (struct bootp_hdr *)pkt;
995 bp->bp_op = OP_BOOTREQUEST;
996 bp->bp_htype = HWT_ETHER;
997 bp->bp_hlen = HWL_ETHER;
999 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
1000 /* Do not set the client IP, your IP, or server IP yet, since it
1001 * hasn't been ACK'ed by the server yet */
1004 * RFC3046 requires Relay Agents to discard packets with
1005 * nonzero and offered giaddr
1008 net_write_ip(&bp->bp_giaddr, zero_ip);
1010 memcpy(bp->bp_chaddr, net_ethaddr, 6);
1011 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
1014 * ID is the id of the OFFER packet
1017 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1020 * Copy options from OFFER packet if present
1023 /* Copy offered IP into the parameters request list */
1024 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1025 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1026 dhcp_server_ip, offered_ip);
1028 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1029 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1030 bcast_ip.s_addr = 0xFFFFFFFFL;
1031 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1033 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1034 net_send_packet(net_tx_packet, pktlen);
1038 * Handle DHCP received packets.
1040 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1041 unsigned src, unsigned len)
1043 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1045 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1046 src, dest, len, dhcp_state);
1048 /* Filter out pkts we don't want */
1049 if (check_reply_packet(pkt, dest, src, len))
1052 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1053 "%d\n", src, dest, len, dhcp_state);
1055 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) {
1056 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1057 store_bootp_params(bp);
1062 switch (dhcp_state) {
1065 * Wait an appropriate time for any potential DHCPOFFER packets
1066 * to arrive. Then select one, and generate DHCPREQUEST
1067 * response. If filename is in format we recognize, assume it
1068 * is a valid OFFER from a server we want.
1070 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1071 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1072 if (strncmp(bp->bp_file,
1073 CONFIG_SYS_BOOTFILE_PREFIX,
1074 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1075 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1076 dhcp_packet_process_options(bp);
1077 if (CONFIG_IS_ENABLED(EFI_LOADER) &&
1078 IS_ENABLED(CONFIG_NETDEVICES))
1079 efi_net_set_dhcp_ack(pkt, len);
1081 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1082 if (!net_server_ip.s_addr)
1083 udelay(CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS *
1085 #endif /* CONFIG_SERVERIP_FROM_PROXYDHCP */
1087 debug("TRANSITIONING TO REQUESTING STATE\n");
1088 dhcp_state = REQUESTING;
1090 net_set_timeout_handler(5000, bootp_timeout_handler);
1091 dhcp_send_request_packet(bp);
1092 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1094 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1099 debug("DHCP State: REQUESTING\n");
1101 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1102 dhcp_packet_process_options(bp);
1103 /* Store net params from reply */
1104 store_net_params(bp);
1106 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1107 &net_ip, get_timer(bootp_start));
1108 net_set_timeout_handler(0, (thand_f *)0);
1109 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1117 /* DHCP client bound to address */
1120 puts("DHCP: INVALID STATE\n");
1125 void dhcp_request(void)
1129 #endif /* CONFIG_CMD_DHCP */