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* Patch by Anders Larsen, 18 Sep 2003:
[people/ms/u-boot.git] / net / net.c
1 /*
2 * Copied from Linux Monitor (LiMon) - Networking.
3 *
4 * Copyright 1994 - 2000 Neil Russell.
5 * (See License)
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9 */
10
11 /*
12 * General Desription:
13 *
14 * The user interface supports commands for BOOTP, RARP, and TFTP.
15 * Also, we support ARP internally. Depending on available data,
16 * these interact as follows:
17 *
18 * BOOTP:
19 *
20 * Prerequisites: - own ethernet address
21 * We want: - own IP address
22 * - TFTP server IP address
23 * - name of bootfile
24 * Next step: ARP
25 *
26 * RARP:
27 *
28 * Prerequisites: - own ethernet address
29 * We want: - own IP address
30 * - TFTP server IP address
31 * Next step: ARP
32 *
33 * ARP:
34 *
35 * Prerequisites: - own ethernet address
36 * - own IP address
37 * - TFTP server IP address
38 * We want: - TFTP server ethernet address
39 * Next step: TFTP
40 *
41 * DHCP:
42 *
43 * Prerequisites: - own ethernet address
44 * We want: - IP, Netmask, ServerIP, Gateway IP
45 * - bootfilename, lease time
46 * Next step: - TFTP
47 *
48 * TFTP:
49 *
50 * Prerequisites: - own ethernet address
51 * - own IP address
52 * - TFTP server IP address
53 * - TFTP server ethernet address
54 * - name of bootfile (if unknown, we use a default name
55 * derived from our own IP address)
56 * We want: - load the boot file
57 * Next step: none
58 */
59
60
61 #include <common.h>
62 #include <watchdog.h>
63 #include <command.h>
64 #include <net.h>
65 #include "bootp.h"
66 #include "tftp.h"
67 #include "rarp.h"
68
69 #if (CONFIG_COMMANDS & CFG_CMD_NET)
70
71 #define ARP_TIMEOUT 5 /* Seconds before trying ARP again */
72 #ifndef CONFIG_NET_RETRY_COUNT
73 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
74 #else
75 # define ARP_TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
76 #endif
77
78 #if 0
79 #define ET_DEBUG
80 #endif
81
82 /** BOOTP EXTENTIONS **/
83
84 IPaddr_t NetOurSubnetMask=0; /* Our subnet mask (0=unknown) */
85 IPaddr_t NetOurGatewayIP=0; /* Our gateways IP address */
86 IPaddr_t NetOurDNSIP=0; /* Our DNS IP address */
87 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
88 IPaddr_t NetOurDNS2IP=0; /* Our 2nd DNS IP address */
89 #endif
90 char NetOurNISDomain[32]={0,}; /* Our NIS domain */
91 char NetOurHostName[32]={0,}; /* Our hostname */
92 char NetOurRootPath[64]={0,}; /* Our bootpath */
93 ushort NetBootFileSize=0; /* Our bootfile size in blocks */
94
95 /** END OF BOOTP EXTENTIONS **/
96
97 ulong NetBootFileXferSize; /* The actual transferred size of the bootfile (in bytes) */
98 uchar NetOurEther[6]; /* Our ethernet address */
99 uchar NetServerEther[6] = /* Boot server enet address */
100 { 0, 0, 0, 0, 0, 0 };
101 IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
102 IPaddr_t NetServerIP; /* Our IP addr (0 = unknown) */
103 volatile uchar *NetRxPkt; /* Current receive packet */
104 int NetRxPktLen; /* Current rx packet length */
105 unsigned NetIPID; /* IP packet ID */
106 uchar NetBcastAddr[6] = /* Ethernet bcast address */
107 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
108 uchar NetEtherNullAddr[6] =
109 { 0, 0, 0, 0, 0, 0 };
110 int NetState; /* Network loop state */
111 #ifdef CONFIG_NET_MULTI
112 int NetRestartWrap = 0; /* Tried all network devices */
113 static int NetRestarted = 0; /* Network loop restarted */
114 static int NetDevExists = 0; /* At least one device configured */
115 #endif
116
117 char BootFile[128]; /* Boot File name */
118
119 #if (CONFIG_COMMANDS & CFG_CMD_PING)
120 IPaddr_t NetPingIP; /* the ip address to ping */
121
122 static void PingStart(void);
123 #endif
124
125 volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
126
127 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */
128
129 static rxhand_f *packetHandler; /* Current RX packet handler */
130 static thand_f *timeHandler; /* Current timeout handler */
131 static ulong timeStart; /* Time base value */
132 static ulong timeDelta; /* Current timeout value */
133 volatile uchar *NetTxPacket = 0; /* THE transmit packet */
134
135 static int net_check_prereq (proto_t protocol);
136
137 /**********************************************************************/
138
139 IPaddr_t NetArpWaitPacketIP;
140 IPaddr_t NetArpWaitReplyIP;
141 uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */
142 uchar *NetArpWaitTxPacket; /* THE transmit packet */
143 int NetArpWaitTxPacketSize;
144 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
145 ulong NetArpWaitTimerStart;
146 int NetArpWaitTry;
147
148 void ArpRequest(void)
149 {
150 int i;
151 volatile uchar *pkt;
152 ARP_t * arp;
153
154 #ifdef ET_DEBUG
155 printf("ARP broadcast %d\n", NetArpWaitTry);
156 #endif
157 pkt = NetTxPacket;
158
159 NetSetEther(pkt, NetBcastAddr, PROT_ARP);
160 pkt += ETHER_HDR_SIZE;
161
162 arp = (ARP_t *)pkt;
163
164 arp->ar_hrd = htons(ARP_ETHER);
165 arp->ar_pro = htons(PROT_IP);
166 arp->ar_hln = 6;
167 arp->ar_pln = 4;
168 arp->ar_op = htons(ARPOP_REQUEST);
169
170 memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
171 NetWriteIP((uchar*)&arp->ar_data[6], NetOurIP); /* source IP addr */
172 for (i=10; i<16; ++i) {
173 arp->ar_data[i] = 0; /* dest ET addr = 0 */
174 }
175
176 if((NetArpWaitPacketIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) {
177 if (NetOurGatewayIP == 0) {
178 puts ("## Warning: gatewayip needed but not set\n");
179 }
180 NetArpWaitReplyIP = NetOurGatewayIP;
181 } else
182 NetArpWaitReplyIP = NetArpWaitPacketIP;
183
184 NetWriteIP((uchar*)&arp->ar_data[16], NetArpWaitReplyIP);
185 (void) eth_send(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
186 }
187
188 void ArpTimeoutCheck(void)
189 {
190 ulong t;
191
192 if (!NetArpWaitPacketIP)
193 return;
194
195 t = get_timer(0);
196
197 /* check for arp timeout */
198 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
199 NetArpWaitTry++;
200
201 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
202 puts ("\nARP Retry count exceeded; starting again\n");
203 NetArpWaitTry = 0;
204 NetStartAgain();
205 } else {
206 NetArpWaitTimerStart = t;
207 ArpRequest();
208 }
209 }
210 }
211
212 /**********************************************************************/
213 /*
214 * Main network processing loop.
215 */
216
217 int
218 NetLoop(proto_t protocol)
219 {
220 DECLARE_GLOBAL_DATA_PTR;
221
222 bd_t *bd = gd->bd;
223
224 #ifdef CONFIG_NET_MULTI
225 NetRestarted = 0;
226 NetDevExists = 0;
227 #endif
228
229 /* XXX problem with bss workaround */
230 NetArpWaitPacketMAC = NULL;
231 NetArpWaitTxPacket = NULL;
232 NetArpWaitPacketIP = 0;
233 NetArpWaitReplyIP = 0;
234 NetArpWaitTxPacket = NULL;
235 NetTxPacket = NULL;
236
237 if (!NetTxPacket) {
238 int i;
239
240 /*
241 * Setup packet buffers, aligned correctly.
242 */
243 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
244 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
245 for (i = 0; i < PKTBUFSRX; i++) {
246 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
247 }
248
249 }
250
251 if (!NetArpWaitTxPacket) {
252 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
253 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
254 NetArpWaitTxPacketSize = 0;
255 }
256
257 eth_halt();
258 if(eth_init(bd) < 0)
259 return(-1);
260
261 restart:
262 #ifdef CONFIG_NET_MULTI
263 memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
264 #else
265 memcpy (NetOurEther, bd->bi_enetaddr, 6);
266 #endif
267
268 NetState = NETLOOP_CONTINUE;
269
270 /*
271 * Start the ball rolling with the given start function. From
272 * here on, this code is a state machine driven by received
273 * packets and timer events.
274 */
275
276 switch (protocol) {
277 #if (CONFIG_COMMANDS & CFG_CMD_PING)
278 case PING:
279 #endif
280 case TFTP:
281 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
282 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
283 NetOurSubnetMask= getenv_IPaddr ("netmask");
284
285 switch (protocol) {
286 case TFTP:
287 NetServerIP = getenv_IPaddr ("serverip");
288 break;
289 #if (CONFIG_COMMANDS & CFG_CMD_PING)
290 case PING:
291 /* nothing */
292 break;
293 #endif
294 default:
295 break;
296 }
297
298 break;
299 case BOOTP:
300 case RARP:
301 /*
302 * initialize our IP addr to 0 in order to accept ANY
303 * IP addr assigned to us by the BOOTP / RARP server
304 */
305 NetOurIP = 0;
306 NetServerIP = 0;
307 break;
308 default:
309 break;
310 }
311
312 switch (net_check_prereq (protocol)) {
313 case 1:
314 /* network not configured */
315 return (-1);
316
317 #ifdef CONFIG_NET_MULTI
318 case 2:
319 /* network device not configured */
320 break;
321 #endif /* CONFIG_NET_MULTI */
322
323 case 0:
324 #ifdef CONFIG_NET_MULTI
325 NetDevExists = 1;
326 #endif
327 switch (protocol) {
328 case TFTP:
329 /* always use ARP to get server ethernet address */
330 TftpStart();
331 break;
332
333 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
334 case DHCP:
335 /* Start with a clean slate... */
336 NetOurIP = 0;
337 NetServerIP = 0;
338 DhcpRequest(); /* Basically same as BOOTP */
339 break;
340 #endif /* CFG_CMD_DHCP */
341
342 case BOOTP:
343 BootpTry = 0;
344 BootpRequest ();
345 break;
346
347 case RARP:
348 RarpTry = 0;
349 RarpRequest ();
350 break;
351 #if (CONFIG_COMMANDS & CFG_CMD_PING)
352 case PING:
353 PingStart();
354 break;
355 #endif
356 default:
357 break;
358 }
359
360 NetBootFileXferSize = 0;
361 break;
362 }
363
364
365 /*
366 * Main packet reception loop. Loop receiving packets until
367 * someone sets `NetQuit'.
368 */
369 for (;;) {
370 WATCHDOG_RESET();
371 #ifdef CONFIG_SHOW_ACTIVITY
372 {
373 extern void show_activity(int arg);
374 show_activity(1);
375 }
376 #endif
377 /*
378 * Check the ethernet for a new packet. The ethernet
379 * receive routine will process it.
380 */
381 eth_rx();
382
383 /*
384 * Abort if ctrl-c was pressed.
385 */
386 if (ctrlc()) {
387 eth_halt();
388 printf("\nAbort\n");
389 return (-1);
390 }
391
392 ArpTimeoutCheck();
393
394 /*
395 * Check for a timeout, and run the timeout handler
396 * if we have one.
397 */
398 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
399 thand_f *x;
400
401 x = timeHandler;
402 timeHandler = (thand_f *)0;
403 (*x)();
404 }
405
406
407 switch (NetState) {
408
409 case NETLOOP_RESTART:
410 #ifdef CONFIG_NET_MULTI
411 NetRestarted = 1;
412 #endif
413 goto restart;
414
415 case NETLOOP_SUCCESS:
416 if (NetBootFileXferSize > 0) {
417 char buf[10];
418 printf("Bytes transferred = %ld (%lx hex)\n",
419 NetBootFileXferSize,
420 NetBootFileXferSize);
421 sprintf(buf, "%lx", NetBootFileXferSize);
422 setenv("filesize", buf);
423 }
424 eth_halt();
425 return NetBootFileXferSize;
426
427 case NETLOOP_FAIL:
428 return (-1);
429 }
430 }
431 }
432
433 /**********************************************************************/
434
435 static void
436 startAgainTimeout(void)
437 {
438 NetState = NETLOOP_RESTART;
439 }
440
441 static void
442 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
443 {
444 /* Totally ignore the packet */
445 }
446
447 void
448 NetStartAgain(void)
449 {
450 #ifndef CONFIG_NET_MULTI
451 NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
452 NetSetHandler(startAgainHandler);
453 #else
454 DECLARE_GLOBAL_DATA_PTR;
455
456 eth_halt();
457 eth_try_another(!NetRestarted);
458 eth_init(gd->bd);
459 if (NetRestartWrap)
460 {
461 NetRestartWrap = 0;
462 if (NetDevExists)
463 {
464 NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
465 NetSetHandler(startAgainHandler);
466 }
467 else
468 {
469 NetState = NETLOOP_FAIL;
470 }
471 }
472 else
473 {
474 NetState = NETLOOP_RESTART;
475 }
476 #endif
477 }
478
479 /**********************************************************************/
480 /*
481 * Miscelaneous bits.
482 */
483
484 void
485 NetSetHandler(rxhand_f * f)
486 {
487 packetHandler = f;
488 }
489
490
491 void
492 NetSetTimeout(int iv, thand_f * f)
493 {
494 if (iv == 0) {
495 timeHandler = (thand_f *)0;
496 } else {
497 timeHandler = f;
498 timeStart = get_timer(0);
499 timeDelta = iv;
500 }
501 }
502
503
504 void
505 NetSendPacket(volatile uchar * pkt, int len)
506 {
507 (void) eth_send(pkt, len);
508 }
509
510 int
511 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
512 {
513 /* convert to new style broadcast */
514 if (dest == 0)
515 dest = 0xFFFFFFFF;
516
517 /* if broadcast, make the ether address a broadcast and don't do ARP */
518 if (dest == 0xFFFFFFFF)
519 ether = NetBcastAddr;
520
521 /* if MAC address was not discovered yet, save the packet and do an ARP request */
522 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
523
524 #ifdef ET_DEBUG
525 printf("sending ARP for %08lx\n", dest);
526 #endif
527
528 NetArpWaitPacketIP = dest;
529 NetArpWaitPacketMAC = ether;
530 NetSetEther (NetArpWaitTxPacket, NetArpWaitPacketMAC, PROT_IP);
531 NetSetIP (NetArpWaitTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
532 memcpy(NetArpWaitTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE,
533 (uchar *)NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE, len);
534
535 /* size of the waiting packet */
536 NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE + len;
537
538 /* and do the ARP request */
539 NetArpWaitTry = 1;
540 NetArpWaitTimerStart = get_timer(0);
541 ArpRequest();
542 return 1; /* waiting */
543 }
544
545 #ifdef ET_DEBUG
546 printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
547 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
548 #endif
549
550 NetSetEther (NetTxPacket, ether, PROT_IP);
551 NetSetIP (NetTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
552 (void) eth_send(NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);
553
554 return 0; /* transmited */
555 }
556
557 #if (CONFIG_COMMANDS & CFG_CMD_PING)
558 static ushort PingSeqNo;
559
560 int PingSend(void)
561 {
562 static uchar mac[6];
563 volatile IP_t *ip;
564 volatile ushort *s;
565
566 /* XXX always send arp request */
567
568 memcpy(mac, NetEtherNullAddr, 6);
569
570 #ifdef ET_DEBUG
571 printf("sending ARP for %08lx\n", NetPingIP);
572 #endif
573
574 NetArpWaitPacketIP = NetPingIP;
575 NetArpWaitPacketMAC = mac;
576
577 NetSetEther(NetArpWaitTxPacket, mac, PROT_IP);
578
579 ip = (volatile IP_t *)(NetArpWaitTxPacket + ETHER_HDR_SIZE);
580
581 /*
582 * Construct an IP and ICMP header. (need to set no fragment bit - XXX)
583 */
584 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
585 ip->ip_tos = 0;
586 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8);
587 ip->ip_id = htons(NetIPID++);
588 ip->ip_off = htons(0x4000); /* No fragmentation */
589 ip->ip_ttl = 255;
590 ip->ip_p = 0x01; /* ICMP */
591 ip->ip_sum = 0;
592 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
593 NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */
594 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
595
596 s = &ip->udp_src; /* XXX ICMP starts here */
597 s[0] = htons(0x0800); /* echo-request, code */
598 s[1] = 0; /* checksum */
599 s[2] = 0; /* identifier */
600 s[3] = htons(PingSeqNo++); /* sequence number */
601 s[1] = ~NetCksum((uchar *)s, 8/2);
602
603 /* size of the waiting packet */
604 NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE_NO_UDP + 8;
605
606 /* and do the ARP request */
607 NetArpWaitTry = 1;
608 NetArpWaitTimerStart = get_timer(0);
609 ArpRequest();
610 return 1; /* waiting */
611 }
612
613 static void
614 PingTimeout (void)
615 {
616 eth_halt();
617 NetState = NETLOOP_FAIL; /* we did not get the reply */
618 }
619
620 static void
621 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
622 {
623 IPaddr_t tmp;
624 volatile IP_t *ip = (volatile IP_t *)pkt;
625
626 tmp = NetReadIP((void *)&ip->ip_src);
627 if (tmp != NetPingIP)
628 return;
629
630 NetState = NETLOOP_SUCCESS;
631 }
632
633 static void PingStart(void)
634 {
635 NetSetTimeout (10 * CFG_HZ, PingTimeout);
636 NetSetHandler (PingHandler);
637
638 PingSend();
639 }
640
641 #endif
642
643 void
644 NetReceive(volatile uchar * pkt, int len)
645 {
646 Ethernet_t *et;
647 IP_t *ip;
648 ARP_t *arp;
649 IPaddr_t tmp;
650 int x;
651
652 NetRxPkt = pkt;
653 NetRxPktLen = len;
654 et = (Ethernet_t *)pkt;
655
656 x = ntohs(et->et_protlen);
657
658 if (x < 1514) {
659 /*
660 * Got a 802 packet. Check the other protocol field.
661 */
662 x = ntohs(et->et_prot);
663 ip = (IP_t *)(pkt + E802_HDR_SIZE);
664 len -= E802_HDR_SIZE;
665 } else {
666 ip = (IP_t *)(pkt + ETHER_HDR_SIZE);
667 len -= ETHER_HDR_SIZE;
668 }
669
670 #ifdef ET_DEBUG
671 printf("Receive from protocol 0x%x\n", x);
672 #endif
673
674 switch (x) {
675
676 case PROT_ARP:
677 /*
678 * We have to deal with two types of ARP packets:
679 * - REQUEST packets will be answered by sending our
680 * IP address - if we know it.
681 * - REPLY packates are expected only after we asked
682 * for the TFTP server's or the gateway's ethernet
683 * address; so if we receive such a packet, we set
684 * the server ethernet address
685 */
686 #ifdef ET_DEBUG
687 printf("Got ARP\n");
688 #endif
689 arp = (ARP_t *)ip;
690 if (len < ARP_HDR_SIZE) {
691 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
692 return;
693 }
694 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
695 return;
696 }
697 if (ntohs(arp->ar_pro) != PROT_IP) {
698 return;
699 }
700 if (arp->ar_hln != 6) {
701 return;
702 }
703 if (arp->ar_pln != 4) {
704 return;
705 }
706
707 if (NetOurIP == 0) {
708 return;
709 }
710
711 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
712 return;
713 }
714
715 switch (ntohs(arp->ar_op)) {
716 case ARPOP_REQUEST: /* reply with our IP address */
717 #ifdef ET_DEBUG
718 printf("Got ARP REQUEST, return our IP\n");
719 #endif
720 NetSetEther((uchar *)et, et->et_src, PROT_ARP);
721 arp->ar_op = htons(ARPOP_REPLY);
722 memcpy (&arp->ar_data[10], &arp->ar_data[0], 6);
723 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
724 memcpy (&arp->ar_data[ 0], NetOurEther, 6);
725 NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
726 (void) eth_send((uchar *)et, ((uchar *)arp-pkt) + ARP_HDR_SIZE);
727 return;
728
729 case ARPOP_REPLY: /* arp reply */
730 /* are we waiting for a reply */
731 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
732 break;
733 #ifdef ET_DEBUG
734 printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
735 arp->ar_data[0], arp->ar_data[1],
736 arp->ar_data[2], arp->ar_data[3],
737 arp->ar_data[4], arp->ar_data[5]);
738 #endif
739
740 tmp = NetReadIP(&arp->ar_data[6]);
741
742 /* matched waiting packet's address */
743 if (tmp == NetArpWaitReplyIP) {
744 #ifdef ET_DEBUG
745 printf("Got it\n");
746 #endif
747 /* save address for later use */
748 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
749
750 /* modify header, and transmit it */
751 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
752 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
753
754 /* no arp request pending now */
755 NetArpWaitPacketIP = 0;
756 NetArpWaitTxPacketSize = 0;
757 NetArpWaitPacketMAC = NULL;
758
759 }
760 return;
761 default:
762 #ifdef ET_DEBUG
763 printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
764 #endif
765 return;
766 }
767
768 case PROT_RARP:
769 #ifdef ET_DEBUG
770 printf("Got RARP\n");
771 #endif
772 arp = (ARP_t *)ip;
773 if (len < ARP_HDR_SIZE) {
774 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
775 return;
776 }
777
778 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
779 (ntohs(arp->ar_hrd) != ARP_ETHER) ||
780 (ntohs(arp->ar_pro) != PROT_IP) ||
781 (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
782
783 printf("invalid RARP header\n");
784 } else {
785 NetCopyIP(&NetOurIP, &arp->ar_data[16]);
786 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
787 memcpy (NetServerEther, &arp->ar_data[ 0], 6);
788
789 (*packetHandler)(0,0,0,0);
790 }
791 break;
792
793 case PROT_IP:
794 #ifdef ET_DEBUG
795 printf("Got IP\n");
796 #endif
797 if (len < IP_HDR_SIZE) {
798 debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
799 return;
800 }
801 if (len < ntohs(ip->ip_len)) {
802 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
803 return;
804 }
805 len = ntohs(ip->ip_len);
806 #ifdef ET_DEBUG
807 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
808 #endif
809 if ((ip->ip_hl_v & 0xf0) != 0x40) {
810 return;
811 }
812 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
813 return;
814 }
815 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
816 printf("checksum bad\n");
817 return;
818 }
819 tmp = NetReadIP(&ip->ip_dst);
820 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
821 return;
822 }
823 /*
824 * watch for ICMP host redirects
825 *
826 * There is no real handler code (yet). We just watch
827 * for ICMP host redirect messages. In case anybody
828 * sees these messages: please contact me
829 * (wd@denx.de), or - even better - send me the
830 * necessary fixes :-)
831 *
832 * Note: in all cases where I have seen this so far
833 * it was a problem with the router configuration,
834 * for instance when a router was configured in the
835 * BOOTP reply, but the TFTP server was on the same
836 * subnet. So this is probably a warning that your
837 * configuration might be wrong. But I'm not really
838 * sure if there aren't any other situations.
839 */
840 if (ip->ip_p == IPPROTO_ICMP) {
841 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
842
843 switch (icmph->type) {
844 case ICMP_REDIRECT:
845 if (icmph->code != ICMP_REDIR_HOST)
846 return;
847 puts (" ICMP Host Redirect to ");
848 print_IPaddr(icmph->un.gateway);
849 putc(' ');
850 break;
851 #if (CONFIG_COMMANDS & CFG_CMD_PING)
852 case ICMP_ECHO_REPLY:
853 /*
854 * IP header OK. Pass the packet to the current handler.
855 */
856 /* XXX point to ip packet */
857 (*packetHandler)((uchar *)ip, 0, 0, 0);
858 break;
859 #endif
860 default:
861 return;
862 }
863 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
864 return;
865 }
866
867 /*
868 * IP header OK. Pass the packet to the current handler.
869 */
870 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
871 ntohs(ip->udp_dst),
872 ntohs(ip->udp_src),
873 ntohs(ip->udp_len) - 8);
874
875 break;
876 }
877 }
878
879
880 /**********************************************************************/
881
882 static int net_check_prereq (proto_t protocol)
883 {
884 switch (protocol) {
885 /* Fall through */
886 #if (CONFIG_COMMANDS & CFG_CMD_PING)
887 case PING:
888 if (NetPingIP == 0) {
889 puts ("*** ERROR: ping address not given\n");
890 return (1);
891 }
892 goto common;
893 #endif
894 case TFTP:
895 if (NetServerIP == 0) {
896 puts ("*** ERROR: `serverip' not set\n");
897 return (1);
898 }
899
900 #if (CONFIG_COMMANDS & CFG_CMD_PING)
901 common:
902 #endif
903
904 if (NetOurIP == 0) {
905 puts ("*** ERROR: `ipaddr' not set\n");
906 return (1);
907 }
908 /* Fall through */
909
910 case DHCP:
911 case RARP:
912 case BOOTP:
913 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
914 #ifdef CONFIG_NET_MULTI
915 extern int eth_get_dev_index (void);
916 int num = eth_get_dev_index();
917
918 switch (num) {
919 case -1:
920 puts ("*** ERROR: No ethernet found.\n");
921 return (1);
922 case 0:
923 puts ("*** ERROR: `ethaddr' not set\n");
924 break;
925 default:
926 printf ("*** ERROR: `eth%daddr' not set\n",
927 num);
928 break;
929 }
930
931 NetStartAgain ();
932 return (2);
933 #else
934 puts ("*** ERROR: `ethaddr' not set\n");
935 return (1);
936 #endif
937 }
938 /* Fall through */
939 default:
940 return(0);
941 }
942 return (0); /* OK */
943 }
944 /**********************************************************************/
945
946 int
947 NetCksumOk(uchar * ptr, int len)
948 {
949 return !((NetCksum(ptr, len) + 1) & 0xfffe);
950 }
951
952
953 unsigned
954 NetCksum(uchar * ptr, int len)
955 {
956 ulong xsum;
957
958 xsum = 0;
959 while (len-- > 0)
960 xsum += *((ushort *)ptr)++;
961 xsum = (xsum & 0xffff) + (xsum >> 16);
962 xsum = (xsum & 0xffff) + (xsum >> 16);
963 return (xsum & 0xffff);
964 }
965
966
967 void
968 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
969 {
970 Ethernet_t *et = (Ethernet_t *)xet;
971
972 memcpy (et->et_dest, addr, 6);
973 memcpy (et->et_src, NetOurEther, 6);
974 et->et_protlen = htons(prot);
975 }
976
977
978 void
979 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
980 {
981 volatile IP_t *ip = (IP_t *)xip;
982
983 /*
984 * If the data is an odd number of bytes, zero the
985 * byte after the last byte so that the checksum
986 * will work.
987 */
988 if (len & 1)
989 xip[IP_HDR_SIZE + len] = 0;
990
991 /*
992 * Construct an IP and UDP header.
993 (need to set no fragment bit - XXX)
994 */
995 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
996 ip->ip_tos = 0;
997 ip->ip_len = htons(IP_HDR_SIZE + len);
998 ip->ip_id = htons(NetIPID++);
999 ip->ip_off = htons(0x4000); /* No fragmentation */
1000 ip->ip_ttl = 255;
1001 ip->ip_p = 17; /* UDP */
1002 ip->ip_sum = 0;
1003 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1004 NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */
1005 ip->udp_src = htons(sport);
1006 ip->udp_dst = htons(dport);
1007 ip->udp_len = htons(8 + len);
1008 ip->udp_xsum = 0;
1009 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1010 }
1011
1012 void copy_filename (uchar *dst, uchar *src, int size)
1013 {
1014 if (*src && (*src == '"')) {
1015 ++src;
1016 --size;
1017 }
1018
1019 while ((--size > 0) && *src && (*src != '"')) {
1020 *dst++ = *src++;
1021 }
1022 *dst = '\0';
1023 }
1024
1025 #endif /* CFG_CMD_NET */
1026
1027 void ip_to_string (IPaddr_t x, char *s)
1028 {
1029 x = ntohl(x);
1030 sprintf (s,"%d.%d.%d.%d",
1031 (int)((x >> 24) & 0xff),
1032 (int)((x >> 16) & 0xff),
1033 (int)((x >> 8) & 0xff),
1034 (int)((x >> 0) & 0xff)
1035 );
1036 }
1037
1038 IPaddr_t string_to_ip(char *s)
1039 {
1040 IPaddr_t addr;
1041 char *e;
1042 int i;
1043
1044 if (s == NULL)
1045 return(0);
1046
1047 for (addr=0, i=0; i<4; ++i) {
1048 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1049 addr <<= 8;
1050 addr |= (val & 0xFF);
1051 if (s) {
1052 s = (*e) ? e+1 : e;
1053 }
1054 }
1055
1056 return (htonl(addr));
1057 }
1058
1059 void print_IPaddr (IPaddr_t x)
1060 {
1061 char tmp[16];
1062
1063 ip_to_string(x, tmp);
1064
1065 puts(tmp);
1066 }
1067
1068 IPaddr_t getenv_IPaddr (char *var)
1069 {
1070 return (string_to_ip(getenv(var)));
1071 }
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