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