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1 /*
2  *      Based on LiMon - BOOTP.
3  *
4  *      Copyright 1994, 1995, 2000 Neil Russell.
5  *      (See License)
6  *      Copyright 2000 Roland Borde
7  *      Copyright 2000 Paolo Scaffardi
8  *      Copyright 2000-2004 Wolfgang Denk, wd@denx.de
9  */
10
11 #include <common.h>
12 #include <command.h>
13 #include <efi_loader.h>
14 #include <net.h>
15 #include <net/tftp.h>
16 #include "bootp.h"
17 #ifdef CONFIG_LED_STATUS
18 #include <status_led.h>
19 #endif
20 #ifdef CONFIG_BOOTP_RANDOM_DELAY
21 #include "net_rand.h"
22 #endif
23
24 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie */
25
26 /*
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
29  * that counter
30  *
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
34  * is reached.
35  */
36 #ifndef CONFIG_NET_RETRY_COUNT
37 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up */
38 #else
39 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
40 #endif
41 #define TIMEOUT_MS      ((3 + (TIMEOUT_COUNT * 5)) * 1000)
42
43 #define PORT_BOOTPS     67              /* BOOTP server UDP port */
44 #define PORT_BOOTPC     68              /* BOOTP client UDP port */
45
46 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list */
47 #define CONFIG_DHCP_MIN_EXT_LEN 64
48 #endif
49
50 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
52 #endif
53
54 u32             bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
55 unsigned int    bootp_num_ids;
56 int             bootp_try;
57 ulong           bootp_start;
58 ulong           bootp_timeout;
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 */
62
63 static ulong time_taken_max;
64
65 #if defined(CONFIG_CMD_DHCP)
66 static dhcp_state_t dhcp_state = INIT;
67 static u32 dhcp_leasetime;
68 static struct in_addr dhcp_server_ip;
69 static u8 dhcp_option_overload;
70 #define OVERLOAD_FILE 1
71 #define OVERLOAD_SNAME 2
72 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
73                         unsigned src, unsigned len);
74
75 /* For Debug */
76 #if 0
77 static char *dhcpmsg2str(int type)
78 {
79         switch (type) {
80         case 1:  return "DHCPDISCOVER"; break;
81         case 2:  return "DHCPOFFER";    break;
82         case 3:  return "DHCPREQUEST";  break;
83         case 4:  return "DHCPDECLINE";  break;
84         case 5:  return "DHCPACK";      break;
85         case 6:  return "DHCPNACK";     break;
86         case 7:  return "DHCPRELEASE";  break;
87         default: return "UNKNOWN/INVALID MSG TYPE"; break;
88         }
89 }
90 #endif
91 #endif
92
93 static void bootp_add_id(ulong id)
94 {
95         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
96                 size_t size = sizeof(bootp_ids) - sizeof(id);
97
98                 memmove(bootp_ids, &bootp_ids[1], size);
99                 bootp_ids[bootp_num_ids - 1] = id;
100         } else {
101                 bootp_ids[bootp_num_ids] = id;
102                 bootp_num_ids++;
103         }
104 }
105
106 static bool bootp_match_id(ulong id)
107 {
108         unsigned int i;
109
110         for (i = 0; i < bootp_num_ids; i++)
111                 if (bootp_ids[i] == id)
112                         return true;
113
114         return false;
115 }
116
117 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
118                               unsigned len)
119 {
120         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
121         int retval = 0;
122
123         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
124                 retval = -1;
125         else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
126                 retval = -2;
127         else if (bp->bp_op != OP_BOOTREPLY)
128                 retval = -3;
129         else if (bp->bp_htype != HWT_ETHER)
130                 retval = -4;
131         else if (bp->bp_hlen != HWL_ETHER)
132                 retval = -5;
133         else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
134                 retval = -6;
135         else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
136                 retval = -7;
137
138         debug("Filtering pkt = %d\n", retval);
139
140         return retval;
141 }
142
143 /*
144  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
145  */
146 static void store_net_params(struct bootp_hdr *bp)
147 {
148 #if !defined(CONFIG_BOOTP_SERVERIP)
149         struct in_addr tmp_ip;
150
151         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
152         if (tmp_ip.s_addr != 0)
153                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
154         memcpy(net_server_ethaddr,
155                ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
156         if (
157 #if defined(CONFIG_CMD_DHCP)
158             !(dhcp_option_overload & OVERLOAD_FILE) &&
159 #endif
160             (strlen(bp->bp_file) > 0)) {
161                 copy_filename(net_boot_file_name, bp->bp_file,
162                               sizeof(net_boot_file_name));
163         }
164
165         debug("net_boot_file_name: %s\n", net_boot_file_name);
166
167         /* Propagate to environment:
168          * don't delete exising entry when BOOTP / DHCP reply does
169          * not contain a new value
170          */
171         if (*net_boot_file_name)
172                 env_set("bootfile", net_boot_file_name);
173 #endif
174         net_copy_ip(&net_ip, &bp->bp_yiaddr);
175 }
176
177 static int truncate_sz(const char *name, int maxlen, int curlen)
178 {
179         if (curlen >= maxlen) {
180                 printf("*** WARNING: %s is too long (%d - max: %d)"
181                         " - truncated\n", name, curlen, maxlen);
182                 curlen = maxlen - 1;
183         }
184         return curlen;
185 }
186
187 #if !defined(CONFIG_CMD_DHCP)
188
189 static void bootp_process_vendor_field(u8 *ext)
190 {
191         int size = *(ext + 1);
192
193         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
194               *(ext + 1));
195
196         net_boot_file_expected_size_in_blocks = 0;
197
198         switch (*ext) {
199                 /* Fixed length fields */
200         case 1:                 /* Subnet mask */
201                 if (net_netmask.s_addr == 0)
202                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
203                 break;
204         case 2:                 /* Time offset - Not yet supported */
205                 break;
206                 /* Variable length fields */
207         case 3:                 /* Gateways list */
208                 if (net_gateway.s_addr == 0)
209                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
210                 break;
211         case 4:                 /* Time server - Not yet supported */
212                 break;
213         case 5:                 /* IEN-116 name server - Not yet supported */
214                 break;
215         case 6:
216                 if (net_dns_server.s_addr == 0)
217                         net_copy_ip(&net_dns_server,
218                                     (struct in_addr *)(ext + 2));
219 #if defined(CONFIG_BOOTP_DNS2)
220                 if ((net_dns_server2.s_addr == 0) && (size > 4))
221                         net_copy_ip(&net_dns_server2,
222                                     (struct in_addr *)(ext + 2 + 4));
223 #endif
224                 break;
225         case 7:                 /* Log server - Not yet supported */
226                 break;
227         case 8:                 /* Cookie/Quote server - Not yet supported */
228                 break;
229         case 9:                 /* LPR server - Not yet supported */
230                 break;
231         case 10:                /* Impress server - Not yet supported */
232                 break;
233         case 11:                /* RPL server - Not yet supported */
234                 break;
235         case 12:                /* Host name */
236                 if (net_hostname[0] == 0) {
237                         size = truncate_sz("Host Name",
238                                 sizeof(net_hostname), size);
239                         memcpy(&net_hostname, ext + 2, size);
240                         net_hostname[size] = 0;
241                 }
242                 break;
243         case 13:                /* Boot file size */
244                 if (size == 2)
245                         net_boot_file_expected_size_in_blocks =
246                                 ntohs(*(ushort *)(ext + 2));
247                 else if (size == 4)
248                         net_boot_file_expected_size_in_blocks =
249                                 ntohl(*(ulong *)(ext + 2));
250                 break;
251         case 14:                /* Merit dump file - Not yet supported */
252                 break;
253         case 15:                /* Domain name - Not yet supported */
254                 break;
255         case 16:                /* Swap server - Not yet supported */
256                 break;
257         case 17:                /* Root path */
258                 if (net_root_path[0] == 0) {
259                         size = truncate_sz("Root Path",
260                                 sizeof(net_root_path), size);
261                         memcpy(&net_root_path, ext + 2, size);
262                         net_root_path[size] = 0;
263                 }
264                 break;
265         case 18:                /* Extension path - Not yet supported */
266                 /*
267                  * This can be used to send the information of the
268                  * vendor area in another file that the client can
269                  * access via TFTP.
270                  */
271                 break;
272                 /* IP host layer fields */
273         case 40:                /* NIS Domain name */
274                 if (net_nis_domain[0] == 0) {
275                         size = truncate_sz("NIS Domain Name",
276                                 sizeof(net_nis_domain), size);
277                         memcpy(&net_nis_domain, ext + 2, size);
278                         net_nis_domain[size] = 0;
279                 }
280                 break;
281 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
282         case 42:        /* NTP server IP */
283                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
284                 break;
285 #endif
286                 /* Application layer fields */
287         case 43:                /* Vendor specific info - Not yet supported */
288                 /*
289                  * Binary information to exchange specific
290                  * product information.
291                  */
292                 break;
293                 /* Reserved (custom) fields (128..254) */
294         }
295 }
296
297 static void bootp_process_vendor(u8 *ext, int size)
298 {
299         u8 *end = ext + size;
300
301         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
302
303         while ((ext < end) && (*ext != 0xff)) {
304                 if (*ext == 0) {
305                         ext++;
306                 } else {
307                         u8 *opt = ext;
308
309                         ext += ext[1] + 2;
310                         if (ext <= end)
311                                 bootp_process_vendor_field(opt);
312                 }
313         }
314
315         debug("[BOOTP] Received fields:\n");
316         if (net_netmask.s_addr)
317                 debug("net_netmask : %pI4\n", &net_netmask);
318
319         if (net_gateway.s_addr)
320                 debug("net_gateway      : %pI4", &net_gateway);
321
322         if (net_boot_file_expected_size_in_blocks)
323                 debug("net_boot_file_expected_size_in_blocks : %d\n",
324                       net_boot_file_expected_size_in_blocks);
325
326         if (net_hostname[0])
327                 debug("net_hostname  : %s\n", net_hostname);
328
329         if (net_root_path[0])
330                 debug("net_root_path  : %s\n", net_root_path);
331
332         if (net_nis_domain[0])
333                 debug("net_nis_domain : %s\n", net_nis_domain);
334
335 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
336         if (net_ntp_server.s_addr)
337                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
338 #endif
339 }
340
341 /*
342  *      Handle a BOOTP received packet.
343  */
344 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
345                           unsigned src, unsigned len)
346 {
347         struct bootp_hdr *bp;
348
349         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
350               src, dest, len, sizeof(struct bootp_hdr));
351
352         bp = (struct bootp_hdr *)pkt;
353
354         /* Filter out pkts we don't want */
355         if (check_reply_packet(pkt, dest, src, len))
356                 return;
357
358         /*
359          *      Got a good BOOTP reply.  Copy the data into our variables.
360          */
361 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
362         status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
363 #endif
364
365         store_net_params(bp);           /* Store net parameters from reply */
366
367         /* Retrieve extended information (we must parse the vendor area) */
368         if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
369                 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
370
371         net_set_timeout_handler(0, (thand_f *)0);
372         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
373
374         debug("Got good BOOTP\n");
375
376         net_auto_load();
377 }
378 #endif
379
380 /*
381  *      Timeout on BOOTP/DHCP request.
382  */
383 static void bootp_timeout_handler(void)
384 {
385         ulong time_taken = get_timer(bootp_start);
386
387         if (time_taken >= time_taken_max) {
388 #ifdef CONFIG_BOOTP_MAY_FAIL
389                 char *ethrotate;
390
391                 ethrotate = env_get("ethrotate");
392                 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
393                     net_restart_wrap) {
394                         puts("\nRetry time exceeded\n");
395                         net_set_state(NETLOOP_FAIL);
396                 } else
397 #endif
398                 {
399                         puts("\nRetry time exceeded; starting again\n");
400                         net_start_again();
401                 }
402         } else {
403                 bootp_timeout *= 2;
404                 if (bootp_timeout > 2000)
405                         bootp_timeout = 2000;
406                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
407                 bootp_request();
408         }
409 }
410
411 #define put_vci(e, str)                                         \
412         do {                                                    \
413                 size_t vci_strlen = strlen(str);                \
414                 *e++ = 60;      /* Vendor Class Identifier */   \
415                 *e++ = vci_strlen;                              \
416                 memcpy(e, str, vci_strlen);                     \
417                 e += vci_strlen;                                \
418         } while (0)
419
420 static u8 *add_vci(u8 *e)
421 {
422         char *vci = NULL;
423         char *env_vci = env_get("bootp_vci");
424
425 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
426         vci = CONFIG_SPL_NET_VCI_STRING;
427 #elif defined(CONFIG_BOOTP_VCI_STRING)
428         vci = CONFIG_BOOTP_VCI_STRING;
429 #endif
430
431         if (env_vci)
432                 vci = env_vci;
433
434         if (vci)
435                 put_vci(e, vci);
436
437         return e;
438 }
439
440 /*
441  *      Initialize BOOTP extension fields in the request.
442  */
443 #if defined(CONFIG_CMD_DHCP)
444 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
445                         struct in_addr requested_ip)
446 {
447         u8 *start = e;
448         u8 *cnt;
449 #ifdef CONFIG_LIB_UUID
450         char *uuid;
451 #endif
452         int clientarch = -1;
453
454 #if defined(CONFIG_BOOTP_VENDOREX)
455         u8 *x;
456 #endif
457 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
458         char *hostname;
459 #endif
460
461         *e++ = 99;              /* RFC1048 Magic Cookie */
462         *e++ = 130;
463         *e++ = 83;
464         *e++ = 99;
465
466         *e++ = 53;              /* DHCP Message Type */
467         *e++ = 1;
468         *e++ = message_type;
469
470         *e++ = 57;              /* Maximum DHCP Message Size */
471         *e++ = 2;
472         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
473         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
474
475         if (server_ip.s_addr) {
476                 int tmp = ntohl(server_ip.s_addr);
477
478                 *e++ = 54;      /* ServerID */
479                 *e++ = 4;
480                 *e++ = tmp >> 24;
481                 *e++ = tmp >> 16;
482                 *e++ = tmp >> 8;
483                 *e++ = tmp & 0xff;
484         }
485
486         if (requested_ip.s_addr) {
487                 int tmp = ntohl(requested_ip.s_addr);
488
489                 *e++ = 50;      /* Requested IP */
490                 *e++ = 4;
491                 *e++ = tmp >> 24;
492                 *e++ = tmp >> 16;
493                 *e++ = tmp >> 8;
494                 *e++ = tmp & 0xff;
495         }
496 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
497         hostname = env_get("hostname");
498         if (hostname) {
499                 int hostnamelen = strlen(hostname);
500
501                 *e++ = 12;      /* Hostname */
502                 *e++ = hostnamelen;
503                 memcpy(e, hostname, hostnamelen);
504                 e += hostnamelen;
505         }
506 #endif
507
508 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
509         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
510 #endif
511
512         if (env_get("bootp_arch"))
513                 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
514
515         if (clientarch > 0) {
516                 *e++ = 93;      /* Client System Architecture */
517                 *e++ = 2;
518                 *e++ = (clientarch >> 8) & 0xff;
519                 *e++ = clientarch & 0xff;
520         }
521
522         *e++ = 94;      /* Client Network Interface Identifier */
523         *e++ = 3;
524         *e++ = 1;       /* type field for UNDI */
525         *e++ = 0;       /* major revision */
526         *e++ = 0;       /* minor revision */
527
528 #ifdef CONFIG_LIB_UUID
529         uuid = env_get("pxeuuid");
530
531         if (uuid) {
532                 if (uuid_str_valid(uuid)) {
533                         *e++ = 97;      /* Client Machine Identifier */
534                         *e++ = 17;
535                         *e++ = 0;       /* type 0 - UUID */
536
537                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
538                         e += 16;
539                 } else {
540                         printf("Invalid pxeuuid: %s\n", uuid);
541                 }
542         }
543 #endif
544
545         e = add_vci(e);
546
547 #if defined(CONFIG_BOOTP_VENDOREX)
548         x = dhcp_vendorex_prep(e);
549         if (x)
550                 return x - start;
551 #endif
552
553         *e++ = 55;              /* Parameter Request List */
554          cnt = e++;             /* Pointer to count of requested items */
555         *cnt = 0;
556 #if defined(CONFIG_BOOTP_SUBNETMASK)
557         *e++  = 1;              /* Subnet Mask */
558         *cnt += 1;
559 #endif
560 #if defined(CONFIG_BOOTP_TIMEOFFSET)
561         *e++  = 2;
562         *cnt += 1;
563 #endif
564 #if defined(CONFIG_BOOTP_GATEWAY)
565         *e++  = 3;              /* Router Option */
566         *cnt += 1;
567 #endif
568 #if defined(CONFIG_BOOTP_DNS)
569         *e++  = 6;              /* DNS Server(s) */
570         *cnt += 1;
571 #endif
572 #if defined(CONFIG_BOOTP_HOSTNAME)
573         *e++  = 12;             /* Hostname */
574         *cnt += 1;
575 #endif
576 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
577         *e++  = 13;             /* Boot File Size */
578         *cnt += 1;
579 #endif
580 #if defined(CONFIG_BOOTP_BOOTPATH)
581         *e++  = 17;             /* Boot path */
582         *cnt += 1;
583 #endif
584 #if defined(CONFIG_BOOTP_NISDOMAIN)
585         *e++  = 40;             /* NIS Domain name request */
586         *cnt += 1;
587 #endif
588 #if defined(CONFIG_BOOTP_NTPSERVER)
589         *e++  = 42;
590         *cnt += 1;
591 #endif
592         /* no options, so back up to avoid sending an empty request list */
593         if (*cnt == 0)
594                 e -= 2;
595
596         *e++  = 255;            /* End of the list */
597
598         /* Pad to minimal length */
599 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
600         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
601                 *e++ = 0;
602 #endif
603
604         return e - start;
605 }
606
607 #else
608 /*
609  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
610  */
611 static int bootp_extended(u8 *e)
612 {
613         u8 *start = e;
614
615         *e++ = 99;              /* RFC1048 Magic Cookie */
616         *e++ = 130;
617         *e++ = 83;
618         *e++ = 99;
619
620 #if defined(CONFIG_CMD_DHCP)
621         *e++ = 53;              /* DHCP Message Type */
622         *e++ = 1;
623         *e++ = DHCP_DISCOVER;
624
625         *e++ = 57;              /* Maximum DHCP Message Size */
626         *e++ = 2;
627         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
628         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
629 #endif
630
631         add_vci(e);
632
633 #if defined(CONFIG_BOOTP_SUBNETMASK)
634         *e++ = 1;               /* Subnet mask request */
635         *e++ = 4;
636         e   += 4;
637 #endif
638
639 #if defined(CONFIG_BOOTP_GATEWAY)
640         *e++ = 3;               /* Default gateway request */
641         *e++ = 4;
642         e   += 4;
643 #endif
644
645 #if defined(CONFIG_BOOTP_DNS)
646         *e++ = 6;               /* Domain Name Server */
647         *e++ = 4;
648         e   += 4;
649 #endif
650
651 #if defined(CONFIG_BOOTP_HOSTNAME)
652         *e++ = 12;              /* Host name request */
653         *e++ = 32;
654         e   += 32;
655 #endif
656
657 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
658         *e++ = 13;              /* Boot file size */
659         *e++ = 2;
660         e   += 2;
661 #endif
662
663 #if defined(CONFIG_BOOTP_BOOTPATH)
664         *e++ = 17;              /* Boot path */
665         *e++ = 32;
666         e   += 32;
667 #endif
668
669 #if defined(CONFIG_BOOTP_NISDOMAIN)
670         *e++ = 40;              /* NIS Domain name request */
671         *e++ = 32;
672         e   += 32;
673 #endif
674 #if defined(CONFIG_BOOTP_NTPSERVER)
675         *e++ = 42;
676         *e++ = 4;
677         e   += 4;
678 #endif
679
680         *e++ = 255;             /* End of the list */
681
682         /*
683          * If nothing in list, remove it altogether. Some DHCP servers get
684          * upset by this minor faux pas and do not respond at all.
685          */
686         if (e == start + 3) {
687                 printf("*** Warning: no DHCP options requested\n");
688                 e -= 3;
689         }
690
691         return e - start;
692 }
693 #endif
694
695 void bootp_reset(void)
696 {
697         bootp_num_ids = 0;
698         bootp_try = 0;
699         bootp_start = get_timer(0);
700         bootp_timeout = 250;
701 }
702
703 void bootp_request(void)
704 {
705         uchar *pkt, *iphdr;
706         struct bootp_hdr *bp;
707         int extlen, pktlen, iplen;
708         int eth_hdr_size;
709 #ifdef CONFIG_BOOTP_RANDOM_DELAY
710         ulong rand_ms;
711 #endif
712         u32 bootp_id;
713         struct in_addr zero_ip;
714         struct in_addr bcast_ip;
715         char *ep;  /* Environment pointer */
716
717         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
718 #if defined(CONFIG_CMD_DHCP)
719         dhcp_state = INIT;
720 #endif
721
722         ep = env_get("bootpretryperiod");
723         if (ep != NULL)
724                 time_taken_max = simple_strtoul(ep, NULL, 10);
725         else
726                 time_taken_max = TIMEOUT_MS;
727
728 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
729         if (bootp_try == 0)
730                 srand_mac();
731
732         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
733                 rand_ms = rand() >> (22 - bootp_try);
734         else            /* After 3rd BOOTP request max 8192 * 1ms */
735                 rand_ms = rand() >> 19;
736
737         printf("Random delay: %ld ms...\n", rand_ms);
738         mdelay(rand_ms);
739
740 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
741
742         printf("BOOTP broadcast %d\n", ++bootp_try);
743         pkt = net_tx_packet;
744         memset((void *)pkt, 0, PKTSIZE);
745
746         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
747         pkt += eth_hdr_size;
748
749         /*
750          * Next line results in incorrect packet size being transmitted,
751          * resulting in errors in some DHCP servers, reporting missing bytes.
752          * Size must be set in packet header after extension length has been
753          * determined.
754          * C. Hallinan, DS4.COM, Inc.
755          */
756         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
757                 sizeof (struct bootp_hdr)); */
758         iphdr = pkt;    /* We need this later for net_set_udp_header() */
759         pkt += IP_UDP_HDR_SIZE;
760
761         bp = (struct bootp_hdr *)pkt;
762         bp->bp_op = OP_BOOTREQUEST;
763         bp->bp_htype = HWT_ETHER;
764         bp->bp_hlen = HWL_ETHER;
765         bp->bp_hops = 0;
766         /*
767          * according to RFC1542, should be 0 on first request, secs since
768          * first request otherwise
769          */
770         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
771         zero_ip.s_addr = 0;
772         net_write_ip(&bp->bp_ciaddr, zero_ip);
773         net_write_ip(&bp->bp_yiaddr, zero_ip);
774         net_write_ip(&bp->bp_siaddr, zero_ip);
775         net_write_ip(&bp->bp_giaddr, zero_ip);
776         memcpy(bp->bp_chaddr, net_ethaddr, 6);
777         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
778
779         /* Request additional information from the BOOTP/DHCP server */
780 #if defined(CONFIG_CMD_DHCP)
781         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
782                                zero_ip);
783 #else
784         extlen = bootp_extended((u8 *)bp->bp_vend);
785 #endif
786
787         /*
788          *      Bootp ID is the lower 4 bytes of our ethernet address
789          *      plus the current time in ms.
790          */
791         bootp_id = ((u32)net_ethaddr[2] << 24)
792                 | ((u32)net_ethaddr[3] << 16)
793                 | ((u32)net_ethaddr[4] << 8)
794                 | (u32)net_ethaddr[5];
795         bootp_id += get_timer(0);
796         bootp_id = htonl(bootp_id);
797         bootp_add_id(bootp_id);
798         net_copy_u32(&bp->bp_id, &bootp_id);
799
800         /*
801          * Calculate proper packet lengths taking into account the
802          * variable size of the options field
803          */
804         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
805         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
806         bcast_ip.s_addr = 0xFFFFFFFFL;
807         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
808         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
809
810 #if defined(CONFIG_CMD_DHCP)
811         dhcp_state = SELECTING;
812         net_set_udp_handler(dhcp_handler);
813 #else
814         net_set_udp_handler(bootp_handler);
815 #endif
816         net_send_packet(net_tx_packet, pktlen);
817 }
818
819 #if defined(CONFIG_CMD_DHCP)
820 static void dhcp_process_options(uchar *popt, uchar *end)
821 {
822         int oplen, size;
823 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
824         int *to_ptr;
825 #endif
826
827         while (popt < end && *popt != 0xff) {
828                 oplen = *(popt + 1);
829                 switch (*popt) {
830                 case 0:
831                         oplen = -1; /* Pad omits len byte */
832                         break;
833                 case 1:
834                         net_copy_ip(&net_netmask, (popt + 2));
835                         break;
836 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
837                 case 2:         /* Time offset  */
838                         to_ptr = &net_ntp_time_offset;
839                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
840                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
841                         break;
842 #endif
843                 case 3:
844                         net_copy_ip(&net_gateway, (popt + 2));
845                         break;
846                 case 6:
847                         net_copy_ip(&net_dns_server, (popt + 2));
848 #if defined(CONFIG_BOOTP_DNS2)
849                         if (*(popt + 1) > 4)
850                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
851 #endif
852                         break;
853                 case 12:
854                         size = truncate_sz("Host Name",
855                                 sizeof(net_hostname), oplen);
856                         memcpy(&net_hostname, popt + 2, size);
857                         net_hostname[size] = 0;
858                         break;
859                 case 15:        /* Ignore Domain Name Option */
860                         break;
861                 case 17:
862                         size = truncate_sz("Root Path",
863                                 sizeof(net_root_path), oplen);
864                         memcpy(&net_root_path, popt + 2, size);
865                         net_root_path[size] = 0;
866                         break;
867                 case 28:        /* Ignore Broadcast Address Option */
868                         break;
869 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
870                 case 42:        /* NTP server IP */
871                         net_copy_ip(&net_ntp_server, (popt + 2));
872                         break;
873 #endif
874                 case 51:
875                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
876                         break;
877                 case 52:
878                         dhcp_option_overload = popt[2];
879                         break;
880                 case 53:        /* Ignore Message Type Option */
881                         break;
882                 case 54:
883                         net_copy_ip(&dhcp_server_ip, (popt + 2));
884                         break;
885                 case 58:        /* Ignore Renewal Time Option */
886                         break;
887                 case 59:        /* Ignore Rebinding Time Option */
888                         break;
889                 case 66:        /* Ignore TFTP server name */
890                         break;
891                 case 67:        /* Bootfile option */
892                         size = truncate_sz("Bootfile",
893                                            sizeof(net_boot_file_name), oplen);
894                         memcpy(&net_boot_file_name, popt + 2, size);
895                         net_boot_file_name[size] = 0;
896                         break;
897                 default:
898 #if defined(CONFIG_BOOTP_VENDOREX)
899                         if (dhcp_vendorex_proc(popt))
900                                 break;
901 #endif
902                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
903                                " %d\n", *popt);
904                         break;
905                 }
906                 popt += oplen + 2;      /* Process next option */
907         }
908 }
909
910 static void dhcp_packet_process_options(struct bootp_hdr *bp)
911 {
912         uchar *popt = (uchar *)&bp->bp_vend[4];
913         uchar *end = popt + BOOTP_HDR_SIZE;
914
915         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
916                 return;
917
918         dhcp_option_overload = 0;
919
920         /*
921          * The 'options' field MUST be interpreted first, 'file' next,
922          * 'sname' last.
923          */
924         dhcp_process_options(popt, end);
925
926         if (dhcp_option_overload & OVERLOAD_FILE) {
927                 popt = (uchar *)bp->bp_file;
928                 end = popt + sizeof(bp->bp_file);
929                 dhcp_process_options(popt, end);
930         }
931
932         if (dhcp_option_overload & OVERLOAD_SNAME) {
933                 popt = (uchar *)bp->bp_sname;
934                 end = popt + sizeof(bp->bp_sname);
935                 dhcp_process_options(popt, end);
936         }
937 }
938
939 static int dhcp_message_type(unsigned char *popt)
940 {
941         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
942                 return -1;
943
944         popt += 4;
945         while (*popt != 0xff) {
946                 if (*popt == 53)        /* DHCP Message Type */
947                         return *(popt + 2);
948                 if (*popt == 0) {
949                         /* Pad */
950                         popt += 1;
951                 } else {
952                         /* Scan through all options */
953                         popt += *(popt + 1) + 2;
954                 }
955         }
956         return -1;
957 }
958
959 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
960 {
961         uchar *pkt, *iphdr;
962         struct bootp_hdr *bp;
963         int pktlen, iplen, extlen;
964         int eth_hdr_size;
965         struct in_addr offered_ip;
966         struct in_addr zero_ip;
967         struct in_addr bcast_ip;
968
969         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
970         pkt = net_tx_packet;
971         memset((void *)pkt, 0, PKTSIZE);
972
973         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
974         pkt += eth_hdr_size;
975
976         iphdr = pkt;    /* We'll need this later to set proper pkt size */
977         pkt += IP_UDP_HDR_SIZE;
978
979         bp = (struct bootp_hdr *)pkt;
980         bp->bp_op = OP_BOOTREQUEST;
981         bp->bp_htype = HWT_ETHER;
982         bp->bp_hlen = HWL_ETHER;
983         bp->bp_hops = 0;
984         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
985         /* Do not set the client IP, your IP, or server IP yet, since it
986          * hasn't been ACK'ed by the server yet */
987
988         /*
989          * RFC3046 requires Relay Agents to discard packets with
990          * nonzero and offered giaddr
991          */
992         zero_ip.s_addr = 0;
993         net_write_ip(&bp->bp_giaddr, zero_ip);
994
995         memcpy(bp->bp_chaddr, net_ethaddr, 6);
996         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
997
998         /*
999          * ID is the id of the OFFER packet
1000          */
1001
1002         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1003
1004         /*
1005          * Copy options from OFFER packet if present
1006          */
1007
1008         /* Copy offered IP into the parameters request list */
1009         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1010         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1011                 dhcp_server_ip, offered_ip);
1012
1013         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1014         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1015         bcast_ip.s_addr = 0xFFFFFFFFL;
1016         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1017
1018 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1019         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1020 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1021         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1022         net_send_packet(net_tx_packet, pktlen);
1023 }
1024
1025 /*
1026  *      Handle DHCP received packets.
1027  */
1028 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1029                          unsigned src, unsigned len)
1030 {
1031         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1032
1033         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1034               src, dest, len, dhcp_state);
1035
1036         /* Filter out pkts we don't want */
1037         if (check_reply_packet(pkt, dest, src, len))
1038                 return;
1039
1040         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1041               "%d\n", src, dest, len, dhcp_state);
1042
1043         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1044                 return;
1045
1046         switch (dhcp_state) {
1047         case SELECTING:
1048                 /*
1049                  * Wait an appropriate time for any potential DHCPOFFER packets
1050                  * to arrive.  Then select one, and generate DHCPREQUEST
1051                  * response.  If filename is in format we recognize, assume it
1052                  * is a valid OFFER from a server we want.
1053                  */
1054                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1055 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1056                 if (strncmp(bp->bp_file,
1057                             CONFIG_SYS_BOOTFILE_PREFIX,
1058                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1059 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1060                         dhcp_packet_process_options(bp);
1061                         efi_net_set_dhcp_ack(pkt, len);
1062
1063                         debug("TRANSITIONING TO REQUESTING STATE\n");
1064                         dhcp_state = REQUESTING;
1065
1066                         net_set_timeout_handler(5000, bootp_timeout_handler);
1067                         dhcp_send_request_packet(bp);
1068 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1069                 }
1070 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1071
1072                 return;
1073                 break;
1074         case REQUESTING:
1075                 debug("DHCP State: REQUESTING\n");
1076
1077                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1078                         dhcp_packet_process_options(bp);
1079                         /* Store net params from reply */
1080                         store_net_params(bp);
1081                         dhcp_state = BOUND;
1082                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1083                                &net_ip, get_timer(bootp_start));
1084                         net_set_timeout_handler(0, (thand_f *)0);
1085                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1086                                             "bootp_stop");
1087
1088                         net_auto_load();
1089                         return;
1090                 }
1091                 break;
1092         case BOUND:
1093                 /* DHCP client bound to address */
1094                 break;
1095         default:
1096                 puts("DHCP: INVALID STATE\n");
1097                 break;
1098         }
1099 }
1100
1101 void dhcp_request(void)
1102 {
1103         bootp_request();
1104 }
1105 #endif  /* CONFIG_CMD_DHCP */