multicast tftp: RFC2090
[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  * NFS:
60  *
61  *      Prerequisites:  - own ethernet address
62  *                      - own IP address
63  *                      - name of bootfile (if unknown, we use a default name
64  *                        derived from our own IP address)
65  *      We want:        - load the boot file
66  *      Next step:      none
67  *
68  * SNTP:
69  *
70  *      Prerequisites:  - own ethernet address
71  *                      - own IP address
72  *      We want:        - network time
73  *      Next step:      none
74  */
75
76
77 #include <common.h>
78 #include <watchdog.h>
79 #include <command.h>
80 #include <net.h>
81 #include "bootp.h"
82 #include "tftp.h"
83 #include "rarp.h"
84 #include "nfs.h"
85 #ifdef CONFIG_STATUS_LED
86 #include <status_led.h>
87 #include <miiphy.h>
88 #endif
89 #if defined(CONFIG_CMD_SNTP)
90 #include "sntp.h"
91 #endif
92
93 #if defined(CONFIG_CMD_NET)
94
95 DECLARE_GLOBAL_DATA_PTR;
96
97 #define ARP_TIMEOUT             5               /* Seconds before trying ARP again */
98 #ifndef CONFIG_NET_RETRY_COUNT
99 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
100 #else
101 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
102 #endif
103
104 #if 0
105 #define ET_DEBUG
106 #endif
107
108 /** BOOTP EXTENTIONS **/
109
110 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
111 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
112 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
113 #if defined(CONFIG_BOOTP_DNS2)
114 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
115 #endif
116 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
117 char            NetOurHostName[32]={0,};        /* Our hostname                 */
118 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
119 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
120
121 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
122 IPaddr_t Mcast_addr;
123 #endif
124
125 /** END OF BOOTP EXTENTIONS **/
126
127 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
128 uchar           NetOurEther[6];         /* Our ethernet address                 */
129 uchar           NetServerEther[6] =     /* Boot server enet address             */
130                         { 0, 0, 0, 0, 0, 0 };
131 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
132 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
133 volatile uchar *NetRxPkt;               /* Current receive packet               */
134 int             NetRxPktLen;            /* Current rx packet length             */
135 unsigned        NetIPID;                /* IP packet ID                         */
136 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
137                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
138 uchar           NetEtherNullAddr[6] =
139                         { 0, 0, 0, 0, 0, 0 };
140 #if defined(CONFIG_CMD_CDP)
141 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
142                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
143 #endif
144 int             NetState;               /* Network loop state                   */
145 #ifdef CONFIG_NET_MULTI
146 int             NetRestartWrap = 0;     /* Tried all network devices            */
147 static int      NetRestarted = 0;       /* Network loop restarted               */
148 static int      NetDevExists = 0;       /* At least one device configured       */
149 #endif
150
151 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
152 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
153 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
154
155 char            BootFile[128];          /* Boot File name                       */
156
157 #if defined(CONFIG_CMD_PING)
158 IPaddr_t        NetPingIP;              /* the ip address to ping               */
159
160 static void PingStart(void);
161 #endif
162
163 #if defined(CONFIG_CMD_CDP)
164 static void CDPStart(void);
165 #endif
166
167 #if defined(CONFIG_CMD_SNTP)
168 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
169 int             NetTimeOffset=0;        /* offset time from UTC                 */
170 #endif
171
172 #ifdef CONFIG_NETCONSOLE
173 void NcStart(void);
174 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
175 #endif
176
177 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
178
179 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
180
181 static rxhand_f *packetHandler;         /* Current RX packet handler            */
182 static thand_f *timeHandler;            /* Current timeout handler              */
183 static ulong    timeStart;              /* Time base value                      */
184 static ulong    timeDelta;              /* Current timeout value                */
185 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
186
187 static int net_check_prereq (proto_t protocol);
188
189 /**********************************************************************/
190
191 IPaddr_t        NetArpWaitPacketIP;
192 IPaddr_t        NetArpWaitReplyIP;
193 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
194 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
195 int             NetArpWaitTxPacketSize;
196 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
197 ulong           NetArpWaitTimerStart;
198 int             NetArpWaitTry;
199
200 void ArpRequest (void)
201 {
202         int i;
203         volatile uchar *pkt;
204         ARP_t *arp;
205
206 #ifdef ET_DEBUG
207         printf ("ARP broadcast %d\n", NetArpWaitTry);
208 #endif
209         pkt = NetTxPacket;
210
211         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
212
213         arp = (ARP_t *) pkt;
214
215         arp->ar_hrd = htons (ARP_ETHER);
216         arp->ar_pro = htons (PROT_IP);
217         arp->ar_hln = 6;
218         arp->ar_pln = 4;
219         arp->ar_op = htons (ARPOP_REQUEST);
220
221         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
222         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
223         for (i = 10; i < 16; ++i) {
224                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
225         }
226
227         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
228             (NetOurIP & NetOurSubnetMask)) {
229                 if (NetOurGatewayIP == 0) {
230                         puts ("## Warning: gatewayip needed but not set\n");
231                         NetArpWaitReplyIP = NetArpWaitPacketIP;
232                 } else {
233                         NetArpWaitReplyIP = NetOurGatewayIP;
234                 }
235         } else {
236                 NetArpWaitReplyIP = NetArpWaitPacketIP;
237         }
238
239         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
240         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
241 }
242
243 void ArpTimeoutCheck(void)
244 {
245         ulong t;
246
247         if (!NetArpWaitPacketIP)
248                 return;
249
250         t = get_timer(0);
251
252         /* check for arp timeout */
253         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
254                 NetArpWaitTry++;
255
256                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
257                         puts ("\nARP Retry count exceeded; starting again\n");
258                         NetArpWaitTry = 0;
259                         NetStartAgain();
260                 } else {
261                         NetArpWaitTimerStart = t;
262                         ArpRequest();
263                 }
264         }
265 }
266
267 /**********************************************************************/
268 /*
269  *      Main network processing loop.
270  */
271
272 int
273 NetLoop(proto_t protocol)
274 {
275         bd_t *bd = gd->bd;
276
277 #ifdef CONFIG_NET_MULTI
278         NetRestarted = 0;
279         NetDevExists = 0;
280 #endif
281
282         /* XXX problem with bss workaround */
283         NetArpWaitPacketMAC = NULL;
284         NetArpWaitTxPacket = NULL;
285         NetArpWaitPacketIP = 0;
286         NetArpWaitReplyIP = 0;
287         NetArpWaitTxPacket = NULL;
288         NetTxPacket = NULL;
289
290         if (!NetTxPacket) {
291                 int     i;
292                 /*
293                  *      Setup packet buffers, aligned correctly.
294                  */
295                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
296                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
297                 for (i = 0; i < PKTBUFSRX; i++) {
298                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
299                 }
300         }
301
302         if (!NetArpWaitTxPacket) {
303                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
304                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
305                 NetArpWaitTxPacketSize = 0;
306         }
307
308         eth_halt();
309 #ifdef CONFIG_NET_MULTI
310         eth_set_current();
311 #endif
312         if (eth_init(bd) < 0) {
313                 eth_halt();
314                 return(-1);
315         }
316
317 restart:
318 #ifdef CONFIG_NET_MULTI
319         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
320 #else
321         memcpy (NetOurEther, bd->bi_enetaddr, 6);
322 #endif
323
324         NetState = NETLOOP_CONTINUE;
325
326         /*
327          *      Start the ball rolling with the given start function.  From
328          *      here on, this code is a state machine driven by received
329          *      packets and timer events.
330          */
331
332         switch (protocol) {
333 #if defined(CONFIG_CMD_NFS)
334         case NFS:
335 #endif
336 #if defined(CONFIG_CMD_PING)
337         case PING:
338 #endif
339 #if defined(CONFIG_CMD_SNTP)
340         case SNTP:
341 #endif
342         case NETCONS:
343         case TFTP:
344                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
345                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
346                 NetOurSubnetMask= getenv_IPaddr ("netmask");
347                 NetOurVLAN = getenv_VLAN("vlan");
348                 NetOurNativeVLAN = getenv_VLAN("nvlan");
349
350                 switch (protocol) {
351 #if defined(CONFIG_CMD_NFS)
352                 case NFS:
353 #endif
354                 case NETCONS:
355                 case TFTP:
356                         NetServerIP = getenv_IPaddr ("serverip");
357                         break;
358 #if defined(CONFIG_CMD_PING)
359                 case PING:
360                         /* nothing */
361                         break;
362 #endif
363 #if defined(CONFIG_CMD_SNTP)
364                 case SNTP:
365                         /* nothing */
366                         break;
367 #endif
368                 default:
369                         break;
370                 }
371
372                 break;
373         case BOOTP:
374         case RARP:
375                 /*
376                  * initialize our IP addr to 0 in order to accept ANY
377                  * IP addr assigned to us by the BOOTP / RARP server
378                  */
379                 NetOurIP = 0;
380                 NetServerIP = getenv_IPaddr ("serverip");
381                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
382                 NetOurNativeVLAN = getenv_VLAN("nvlan");
383         case CDP:
384                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
385                 NetOurNativeVLAN = getenv_VLAN("nvlan");
386                 break;
387         default:
388                 break;
389         }
390
391         switch (net_check_prereq (protocol)) {
392         case 1:
393                 /* network not configured */
394                 eth_halt();
395                 return (-1);
396
397 #ifdef CONFIG_NET_MULTI
398         case 2:
399                 /* network device not configured */
400                 break;
401 #endif /* CONFIG_NET_MULTI */
402
403         case 0:
404 #ifdef CONFIG_NET_MULTI
405                 NetDevExists = 1;
406 #endif
407                 switch (protocol) {
408                 case TFTP:
409                         /* always use ARP to get server ethernet address */
410                         TftpStart();
411                         break;
412
413 #if defined(CONFIG_CMD_DHCP)
414                 case DHCP:
415                         /* Start with a clean slate... */
416                         BootpTry = 0;
417                         NetOurIP = 0;
418                         NetServerIP = getenv_IPaddr ("serverip");
419                         DhcpRequest();          /* Basically same as BOOTP */
420                         break;
421 #endif
422
423                 case BOOTP:
424                         BootpTry = 0;
425                         BootpRequest ();
426                         break;
427
428                 case RARP:
429                         RarpTry = 0;
430                         RarpRequest ();
431                         break;
432 #if defined(CONFIG_CMD_PING)
433                 case PING:
434                         PingStart();
435                         break;
436 #endif
437 #if defined(CONFIG_CMD_NFS)
438                 case NFS:
439                         NfsStart();
440                         break;
441 #endif
442 #if defined(CONFIG_CMD_CDP)
443                 case CDP:
444                         CDPStart();
445                         break;
446 #endif
447 #ifdef CONFIG_NETCONSOLE
448                 case NETCONS:
449                         NcStart();
450                         break;
451 #endif
452 #if defined(CONFIG_CMD_SNTP)
453                 case SNTP:
454                         SntpStart();
455                         break;
456 #endif
457                 default:
458                         break;
459                 }
460
461                 NetBootFileXferSize = 0;
462                 break;
463         }
464
465 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
466 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
467         /*
468          * Echo the inverted link state to the fault LED.
469          */
470         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
471                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
472         } else {
473                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
474         }
475 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
476 #endif /* CONFIG_MII, ... */
477
478         /*
479          *      Main packet reception loop.  Loop receiving packets until
480          *      someone sets `NetState' to a state that terminates.
481          */
482         for (;;) {
483                 WATCHDOG_RESET();
484 #ifdef CONFIG_SHOW_ACTIVITY
485                 {
486                         extern void show_activity(int arg);
487                         show_activity(1);
488                 }
489 #endif
490                 /*
491                  *      Check the ethernet for a new packet.  The ethernet
492                  *      receive routine will process it.
493                  */
494                         eth_rx();
495
496                 /*
497                  *      Abort if ctrl-c was pressed.
498                  */
499                 if (ctrlc()) {
500                         eth_halt();
501                         puts ("\nAbort\n");
502                         return (-1);
503                 }
504
505                 ArpTimeoutCheck();
506
507                 /*
508                  *      Check for a timeout, and run the timeout handler
509                  *      if we have one.
510                  */
511                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
512                         thand_f *x;
513
514 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
515 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
516       defined(CONFIG_STATUS_LED) &&        \
517       defined(STATUS_LED_RED)
518                         /*
519                          * Echo the inverted link state to the fault LED.
520                          */
521                         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
522                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
523                         } else {
524                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
525                         }
526 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
527 #endif /* CONFIG_MII, ... */
528                         x = timeHandler;
529                         timeHandler = (thand_f *)0;
530                         (*x)();
531                 }
532
533
534                 switch (NetState) {
535
536                 case NETLOOP_RESTART:
537 #ifdef CONFIG_NET_MULTI
538                         NetRestarted = 1;
539 #endif
540                         goto restart;
541
542                 case NETLOOP_SUCCESS:
543                         if (NetBootFileXferSize > 0) {
544                                 char buf[10];
545                                 printf("Bytes transferred = %ld (%lx hex)\n",
546                                         NetBootFileXferSize,
547                                         NetBootFileXferSize);
548                                 sprintf(buf, "%lx", NetBootFileXferSize);
549                                 setenv("filesize", buf);
550
551                                 sprintf(buf, "%lX", (unsigned long)load_addr);
552                                 setenv("fileaddr", buf);
553                         }
554                         eth_halt();
555                         return NetBootFileXferSize;
556
557                 case NETLOOP_FAIL:
558                         return (-1);
559                 }
560         }
561 }
562
563 /**********************************************************************/
564
565 static void
566 startAgainTimeout(void)
567 {
568         NetState = NETLOOP_RESTART;
569 }
570
571 static void
572 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
573 {
574         /* Totally ignore the packet */
575 }
576
577 void NetStartAgain (void)
578 {
579         char *nretry;
580         int noretry = 0, once = 0;
581
582         if ((nretry = getenv ("netretry")) != NULL) {
583                 noretry = (strcmp (nretry, "no") == 0);
584                 once = (strcmp (nretry, "once") == 0);
585         }
586         if (noretry) {
587                 eth_halt ();
588                 NetState = NETLOOP_FAIL;
589                 return;
590         }
591 #ifndef CONFIG_NET_MULTI
592         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
593         NetSetHandler (startAgainHandler);
594 #else   /* !CONFIG_NET_MULTI*/
595         eth_halt ();
596         eth_try_another (!NetRestarted);
597         eth_init (gd->bd);
598         if (NetRestartWrap) {
599                 NetRestartWrap = 0;
600                 if (NetDevExists && !once) {
601                         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
602                         NetSetHandler (startAgainHandler);
603                 } else {
604                         NetState = NETLOOP_FAIL;
605                 }
606         } else {
607                 NetState = NETLOOP_RESTART;
608         }
609 #endif  /* CONFIG_NET_MULTI */
610 }
611
612 /**********************************************************************/
613 /*
614  *      Miscelaneous bits.
615  */
616
617 void
618 NetSetHandler(rxhand_f * f)
619 {
620         packetHandler = f;
621 }
622
623
624 void
625 NetSetTimeout(ulong iv, thand_f * f)
626 {
627         if (iv == 0) {
628                 timeHandler = (thand_f *)0;
629         } else {
630                 timeHandler = f;
631                 timeStart = get_timer(0);
632                 timeDelta = iv;
633         }
634 }
635
636
637 void
638 NetSendPacket(volatile uchar * pkt, int len)
639 {
640         (void) eth_send(pkt, len);
641 }
642
643 int
644 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
645 {
646         uchar *pkt;
647
648         /* convert to new style broadcast */
649         if (dest == 0)
650                 dest = 0xFFFFFFFF;
651
652         /* if broadcast, make the ether address a broadcast and don't do ARP */
653         if (dest == 0xFFFFFFFF)
654                 ether = NetBcastAddr;
655
656         /* if MAC address was not discovered yet, save the packet and do an ARP request */
657         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
658
659 #ifdef ET_DEBUG
660                 printf("sending ARP for %08lx\n", dest);
661 #endif
662                 NetArpWaitPacketIP = dest;
663                 NetArpWaitPacketMAC = ether;
664
665                 pkt = NetArpWaitTxPacket;
666                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
667
668                 NetSetIP (pkt, dest, dport, sport, len);
669                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
670
671                 /* size of the waiting packet */
672                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
673
674                 /* and do the ARP request */
675                 NetArpWaitTry = 1;
676                 NetArpWaitTimerStart = get_timer(0);
677                 ArpRequest();
678                 return 1;       /* waiting */
679         }
680
681 #ifdef ET_DEBUG
682         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
683                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
684 #endif
685
686         pkt = (uchar *)NetTxPacket;
687         pkt += NetSetEther (pkt, ether, PROT_IP);
688         NetSetIP (pkt, dest, dport, sport, len);
689         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
690
691         return 0;       /* transmitted */
692 }
693
694 #if defined(CONFIG_CMD_PING)
695 static ushort PingSeqNo;
696
697 int PingSend(void)
698 {
699         static uchar mac[6];
700         volatile IP_t *ip;
701         volatile ushort *s;
702         uchar *pkt;
703
704         /* XXX always send arp request */
705
706         memcpy(mac, NetEtherNullAddr, 6);
707
708 #ifdef ET_DEBUG
709         printf("sending ARP for %08lx\n", NetPingIP);
710 #endif
711
712         NetArpWaitPacketIP = NetPingIP;
713         NetArpWaitPacketMAC = mac;
714
715         pkt = NetArpWaitTxPacket;
716         pkt += NetSetEther(pkt, mac, PROT_IP);
717
718         ip = (volatile IP_t *)pkt;
719
720         /*
721          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
722          */
723         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
724         ip->ip_tos   = 0;
725         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
726         ip->ip_id    = htons(NetIPID++);
727         ip->ip_off   = htons(0x4000);   /* No fragmentation */
728         ip->ip_ttl   = 255;
729         ip->ip_p     = 0x01;            /* ICMP */
730         ip->ip_sum   = 0;
731         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
732         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
733         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
734
735         s = &ip->udp_src;               /* XXX ICMP starts here */
736         s[0] = htons(0x0800);           /* echo-request, code */
737         s[1] = 0;                       /* checksum */
738         s[2] = 0;                       /* identifier */
739         s[3] = htons(PingSeqNo++);      /* sequence number */
740         s[1] = ~NetCksum((uchar *)s, 8/2);
741
742         /* size of the waiting packet */
743         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
744
745         /* and do the ARP request */
746         NetArpWaitTry = 1;
747         NetArpWaitTimerStart = get_timer(0);
748         ArpRequest();
749         return 1;       /* waiting */
750 }
751
752 static void
753 PingTimeout (void)
754 {
755         eth_halt();
756         NetState = NETLOOP_FAIL;        /* we did not get the reply */
757 }
758
759 static void
760 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
761 {
762         IPaddr_t tmp;
763         volatile IP_t *ip = (volatile IP_t *)pkt;
764
765         tmp = NetReadIP((void *)&ip->ip_src);
766         if (tmp != NetPingIP)
767                 return;
768
769         NetState = NETLOOP_SUCCESS;
770 }
771
772 static void PingStart(void)
773 {
774 #if defined(CONFIG_NET_MULTI)
775         printf ("Using %s device\n", eth_get_name());
776 #endif  /* CONFIG_NET_MULTI */
777         NetSetTimeout (10 * CFG_HZ, PingTimeout);
778         NetSetHandler (PingHandler);
779
780         PingSend();
781 }
782 #endif
783
784 #if defined(CONFIG_CMD_CDP)
785
786 #define CDP_DEVICE_ID_TLV               0x0001
787 #define CDP_ADDRESS_TLV                 0x0002
788 #define CDP_PORT_ID_TLV                 0x0003
789 #define CDP_CAPABILITIES_TLV            0x0004
790 #define CDP_VERSION_TLV                 0x0005
791 #define CDP_PLATFORM_TLV                0x0006
792 #define CDP_NATIVE_VLAN_TLV             0x000a
793 #define CDP_APPLIANCE_VLAN_TLV          0x000e
794 #define CDP_TRIGGER_TLV                 0x000f
795 #define CDP_POWER_CONSUMPTION_TLV       0x0010
796 #define CDP_SYSNAME_TLV                 0x0014
797 #define CDP_SYSOBJECT_TLV               0x0015
798 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
799
800 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
801
802 static int CDPSeq;
803 static int CDPOK;
804
805 ushort CDPNativeVLAN;
806 ushort CDPApplianceVLAN;
807
808 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
809
810 static ushort CDP_compute_csum(const uchar *buff, ushort len)
811 {
812         ushort csum;
813         int     odd;
814         ulong   result = 0;
815         ushort  leftover;
816         ushort *p;
817
818         if (len > 0) {
819                 odd = 1 & (ulong)buff;
820                 if (odd) {
821                         result = *buff << 8;
822                         len--;
823                         buff++;
824                 }
825                 while (len > 1) {
826                         p = (ushort *)buff;
827                         result += *p++;
828                         buff = (uchar *)p;
829                         if (result & 0x80000000)
830                                 result = (result & 0xFFFF) + (result >> 16);
831                         len -= 2;
832                 }
833                 if (len) {
834                         leftover = (signed short)(*(const signed char *)buff);
835                         /* CISCO SUCKS big time! (and blows too):
836                          * CDP uses the IP checksum algorithm with a twist;
837                          * for the last byte it *sign* extends and sums.
838                          */
839                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
840                 }
841                 while (result >> 16)
842                         result = (result & 0xFFFF) + (result >> 16);
843
844                 if (odd)
845                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
846         }
847
848         /* add up 16-bit and 17-bit words for 17+c bits */
849         result = (result & 0xffff) + (result >> 16);
850         /* add up 16-bit and 2-bit for 16+c bit */
851         result = (result & 0xffff) + (result >> 16);
852         /* add up carry.. */
853         result = (result & 0xffff) + (result >> 16);
854
855         /* negate */
856         csum = ~(ushort)result;
857
858         /* run time endian detection */
859         if (csum != htons(csum))        /* little endian */
860                 csum = htons(csum);
861
862         return csum;
863 }
864
865 int CDPSendTrigger(void)
866 {
867         volatile uchar *pkt;
868         volatile ushort *s;
869         volatile ushort *cp;
870         Ethernet_t *et;
871         int len;
872         ushort chksum;
873 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
874     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
875         char buf[32];
876 #endif
877
878         pkt = NetTxPacket;
879         et = (Ethernet_t *)pkt;
880
881         /* NOTE: trigger sent not on any VLAN */
882
883         /* form ethernet header */
884         memcpy(et->et_dest, NetCDPAddr, 6);
885         memcpy(et->et_src, NetOurEther, 6);
886
887         pkt += ETHER_HDR_SIZE;
888
889         /* SNAP header */
890         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
891         pkt += sizeof(CDP_SNAP_hdr);
892
893         /* CDP header */
894         *pkt++ = 0x02;                          /* CDP version 2 */
895         *pkt++ = 180;                           /* TTL */
896         s = (volatile ushort *)pkt;
897         cp = s;
898         *s++ = htons(0);                        /* checksum (0 for later calculation) */
899
900         /* CDP fields */
901 #ifdef CONFIG_CDP_DEVICE_ID
902         *s++ = htons(CDP_DEVICE_ID_TLV);
903         *s++ = htons(CONFIG_CDP_DEVICE_ID);
904         memset(buf, 0, sizeof(buf));
905         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
906                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
907                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
908                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
909         memcpy((uchar *)s, buf, 16);
910         s += 16 / 2;
911 #endif
912
913 #ifdef CONFIG_CDP_PORT_ID
914         *s++ = htons(CDP_PORT_ID_TLV);
915         memset(buf, 0, sizeof(buf));
916         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
917         len = strlen(buf);
918         if (len & 1)    /* make it even */
919                 len++;
920         *s++ = htons(len + 4);
921         memcpy((uchar *)s, buf, len);
922         s += len / 2;
923 #endif
924
925 #ifdef CONFIG_CDP_CAPABILITIES
926         *s++ = htons(CDP_CAPABILITIES_TLV);
927         *s++ = htons(8);
928         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
929         s += 2;
930 #endif
931
932 #ifdef CONFIG_CDP_VERSION
933         *s++ = htons(CDP_VERSION_TLV);
934         memset(buf, 0, sizeof(buf));
935         strcpy(buf, CONFIG_CDP_VERSION);
936         len = strlen(buf);
937         if (len & 1)    /* make it even */
938                 len++;
939         *s++ = htons(len + 4);
940         memcpy((uchar *)s, buf, len);
941         s += len / 2;
942 #endif
943
944 #ifdef CONFIG_CDP_PLATFORM
945         *s++ = htons(CDP_PLATFORM_TLV);
946         memset(buf, 0, sizeof(buf));
947         strcpy(buf, CONFIG_CDP_PLATFORM);
948         len = strlen(buf);
949         if (len & 1)    /* make it even */
950                 len++;
951         *s++ = htons(len + 4);
952         memcpy((uchar *)s, buf, len);
953         s += len / 2;
954 #endif
955
956 #ifdef CONFIG_CDP_TRIGGER
957         *s++ = htons(CDP_TRIGGER_TLV);
958         *s++ = htons(8);
959         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
960         s += 2;
961 #endif
962
963 #ifdef CONFIG_CDP_POWER_CONSUMPTION
964         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
965         *s++ = htons(6);
966         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
967 #endif
968
969         /* length of ethernet packet */
970         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
971         et->et_protlen = htons(len);
972
973         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
974         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
975         if (chksum == 0)
976                 chksum = 0xFFFF;
977         *cp = htons(chksum);
978
979         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
980         return 0;
981 }
982
983 static void
984 CDPTimeout (void)
985 {
986         CDPSeq++;
987
988         if (CDPSeq < 3) {
989                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
990                 CDPSendTrigger();
991                 return;
992         }
993
994         /* if not OK try again */
995         if (!CDPOK)
996                 NetStartAgain();
997         else
998                 NetState = NETLOOP_SUCCESS;
999 }
1000
1001 static void
1002 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1003 {
1004         /* nothing */
1005 }
1006
1007 static void
1008 CDPHandler(const uchar * pkt, unsigned len)
1009 {
1010         const uchar *t;
1011         const ushort *ss;
1012         ushort type, tlen;
1013         uchar applid;
1014         ushort vlan, nvlan;
1015
1016         /* minimum size? */
1017         if (len < sizeof(CDP_SNAP_hdr) + 4)
1018                 goto pkt_short;
1019
1020         /* check for valid CDP SNAP header */
1021         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1022                 return;
1023
1024         pkt += sizeof(CDP_SNAP_hdr);
1025         len -= sizeof(CDP_SNAP_hdr);
1026
1027         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1028         if (pkt[0] < 0x02 || pkt[1] == 0)
1029                 return;
1030
1031         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1032         if (pkt[0] != 0x02)
1033                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1034                                 pkt[0] & 0xff);
1035
1036         if (CDP_compute_csum(pkt, len) != 0)
1037                 return;
1038
1039         pkt += 4;
1040         len -= 4;
1041
1042         vlan = htons(-1);
1043         nvlan = htons(-1);
1044         while (len > 0) {
1045                 if (len < 4)
1046                         goto pkt_short;
1047
1048                 ss = (const ushort *)pkt;
1049                 type = ntohs(ss[0]);
1050                 tlen = ntohs(ss[1]);
1051                 if (tlen > len) {
1052                         goto pkt_short;
1053                 }
1054
1055                 pkt += tlen;
1056                 len -= tlen;
1057
1058                 ss += 2;        /* point ss to the data of the TLV */
1059                 tlen -= 4;
1060
1061                 switch (type) {
1062                         case CDP_DEVICE_ID_TLV:
1063                                 break;
1064                         case CDP_ADDRESS_TLV:
1065                                 break;
1066                         case CDP_PORT_ID_TLV:
1067                                 break;
1068                         case CDP_CAPABILITIES_TLV:
1069                                 break;
1070                         case CDP_VERSION_TLV:
1071                                 break;
1072                         case CDP_PLATFORM_TLV:
1073                                 break;
1074                         case CDP_NATIVE_VLAN_TLV:
1075                                 nvlan = *ss;
1076                                 break;
1077                         case CDP_APPLIANCE_VLAN_TLV:
1078                                 t = (const uchar *)ss;
1079                                 while (tlen > 0) {
1080                                         if (tlen < 3)
1081                                                 goto pkt_short;
1082
1083                                         applid = t[0];
1084                                         ss = (const ushort *)(t + 1);
1085
1086 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1087                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1088                                                 vlan = *ss;
1089 #else
1090                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1091 #endif
1092                                         t += 3; tlen -= 3;
1093                                 }
1094                                 break;
1095                         case CDP_TRIGGER_TLV:
1096                                 break;
1097                         case CDP_POWER_CONSUMPTION_TLV:
1098                                 break;
1099                         case CDP_SYSNAME_TLV:
1100                                 break;
1101                         case CDP_SYSOBJECT_TLV:
1102                                 break;
1103                         case CDP_MANAGEMENT_ADDRESS_TLV:
1104                                 break;
1105                 }
1106         }
1107
1108         CDPApplianceVLAN = vlan;
1109         CDPNativeVLAN = nvlan;
1110
1111         CDPOK = 1;
1112         return;
1113
1114  pkt_short:
1115         printf("** CDP packet is too short\n");
1116         return;
1117 }
1118
1119 static void CDPStart(void)
1120 {
1121 #if defined(CONFIG_NET_MULTI)
1122         printf ("Using %s device\n", eth_get_name());
1123 #endif
1124         CDPSeq = 0;
1125         CDPOK = 0;
1126
1127         CDPNativeVLAN = htons(-1);
1128         CDPApplianceVLAN = htons(-1);
1129
1130         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1131         NetSetHandler (CDPDummyHandler);
1132
1133         CDPSendTrigger();
1134 }
1135 #endif
1136
1137
1138 void
1139 NetReceive(volatile uchar * inpkt, int len)
1140 {
1141         Ethernet_t *et;
1142         IP_t    *ip;
1143         ARP_t   *arp;
1144         IPaddr_t tmp;
1145         int     x;
1146         uchar *pkt;
1147 #if defined(CONFIG_CMD_CDP)
1148         int iscdp;
1149 #endif
1150         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1151
1152 #ifdef ET_DEBUG
1153         printf("packet received\n");
1154 #endif
1155
1156         NetRxPkt = inpkt;
1157         NetRxPktLen = len;
1158         et = (Ethernet_t *)inpkt;
1159
1160         /* too small packet? */
1161         if (len < ETHER_HDR_SIZE)
1162                 return;
1163
1164 #if defined(CONFIG_CMD_CDP)
1165         /* keep track if packet is CDP */
1166         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1167 #endif
1168
1169         myvlanid = ntohs(NetOurVLAN);
1170         if (myvlanid == (ushort)-1)
1171                 myvlanid = VLAN_NONE;
1172         mynvlanid = ntohs(NetOurNativeVLAN);
1173         if (mynvlanid == (ushort)-1)
1174                 mynvlanid = VLAN_NONE;
1175
1176         x = ntohs(et->et_protlen);
1177
1178 #ifdef ET_DEBUG
1179         printf("packet received\n");
1180 #endif
1181
1182         if (x < 1514) {
1183                 /*
1184                  *      Got a 802 packet.  Check the other protocol field.
1185                  */
1186                 x = ntohs(et->et_prot);
1187
1188                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1189                 len -= E802_HDR_SIZE;
1190
1191         } else if (x != PROT_VLAN) {    /* normal packet */
1192                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1193                 len -= ETHER_HDR_SIZE;
1194
1195         } else {                        /* VLAN packet */
1196                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1197
1198 #ifdef ET_DEBUG
1199                 printf("VLAN packet received\n");
1200 #endif
1201                 /* too small packet? */
1202                 if (len < VLAN_ETHER_HDR_SIZE)
1203                         return;
1204
1205                 /* if no VLAN active */
1206                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1207 #if defined(CONFIG_CMD_CDP)
1208                                 && iscdp == 0
1209 #endif
1210                                 )
1211                         return;
1212
1213                 cti = ntohs(vet->vet_tag);
1214                 vlanid = cti & VLAN_IDMASK;
1215                 x = ntohs(vet->vet_type);
1216
1217                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1218                 len -= VLAN_ETHER_HDR_SIZE;
1219         }
1220
1221 #ifdef ET_DEBUG
1222         printf("Receive from protocol 0x%x\n", x);
1223 #endif
1224
1225 #if defined(CONFIG_CMD_CDP)
1226         if (iscdp) {
1227                 CDPHandler((uchar *)ip, len);
1228                 return;
1229         }
1230 #endif
1231
1232         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1233                 if (vlanid == VLAN_NONE)
1234                         vlanid = (mynvlanid & VLAN_IDMASK);
1235                 /* not matched? */
1236                 if (vlanid != (myvlanid & VLAN_IDMASK))
1237                         return;
1238         }
1239
1240         switch (x) {
1241
1242         case PROT_ARP:
1243                 /*
1244                  * We have to deal with two types of ARP packets:
1245                  * - REQUEST packets will be answered by sending  our
1246                  *   IP address - if we know it.
1247                  * - REPLY packates are expected only after we asked
1248                  *   for the TFTP server's or the gateway's ethernet
1249                  *   address; so if we receive such a packet, we set
1250                  *   the server ethernet address
1251                  */
1252 #ifdef ET_DEBUG
1253                 puts ("Got ARP\n");
1254 #endif
1255                 arp = (ARP_t *)ip;
1256                 if (len < ARP_HDR_SIZE) {
1257                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1258                         return;
1259                 }
1260                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1261                         return;
1262                 }
1263                 if (ntohs(arp->ar_pro) != PROT_IP) {
1264                         return;
1265                 }
1266                 if (arp->ar_hln != 6) {
1267                         return;
1268                 }
1269                 if (arp->ar_pln != 4) {
1270                         return;
1271                 }
1272
1273                 if (NetOurIP == 0) {
1274                         return;
1275                 }
1276
1277                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1278                         return;
1279                 }
1280
1281                 switch (ntohs(arp->ar_op)) {
1282                 case ARPOP_REQUEST:             /* reply with our IP address    */
1283 #ifdef ET_DEBUG
1284                         puts ("Got ARP REQUEST, return our IP\n");
1285 #endif
1286                         pkt = (uchar *)et;
1287                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1288                         arp->ar_op = htons(ARPOP_REPLY);
1289                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1290                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1291                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1292                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1293                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1294                         return;
1295
1296                 case ARPOP_REPLY:               /* arp reply */
1297                         /* are we waiting for a reply */
1298                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1299                                 break;
1300 #ifdef ET_DEBUG
1301                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1302                                 arp->ar_data[0], arp->ar_data[1],
1303                                 arp->ar_data[2], arp->ar_data[3],
1304                                 arp->ar_data[4], arp->ar_data[5]);
1305 #endif
1306
1307                         tmp = NetReadIP(&arp->ar_data[6]);
1308
1309                         /* matched waiting packet's address */
1310                         if (tmp == NetArpWaitReplyIP) {
1311 #ifdef ET_DEBUG
1312                                 puts ("Got it\n");
1313 #endif
1314                                 /* save address for later use */
1315                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1316
1317 #ifdef CONFIG_NETCONSOLE
1318                                 (*packetHandler)(0,0,0,0);
1319 #endif
1320                                 /* modify header, and transmit it */
1321                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1322                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1323
1324                                 /* no arp request pending now */
1325                                 NetArpWaitPacketIP = 0;
1326                                 NetArpWaitTxPacketSize = 0;
1327                                 NetArpWaitPacketMAC = NULL;
1328
1329                         }
1330                         return;
1331                 default:
1332 #ifdef ET_DEBUG
1333                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1334 #endif
1335                         return;
1336                 }
1337                 break;
1338
1339         case PROT_RARP:
1340 #ifdef ET_DEBUG
1341                 puts ("Got RARP\n");
1342 #endif
1343                 arp = (ARP_t *)ip;
1344                 if (len < ARP_HDR_SIZE) {
1345                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1346                         return;
1347                 }
1348
1349                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1350                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1351                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1352                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1353
1354                         puts ("invalid RARP header\n");
1355                 } else {
1356                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1357                         if (NetServerIP == 0)
1358                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1359                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1360
1361                         (*packetHandler)(0,0,0,0);
1362                 }
1363                 break;
1364
1365         case PROT_IP:
1366 #ifdef ET_DEBUG
1367                 puts ("Got IP\n");
1368 #endif
1369                 if (len < IP_HDR_SIZE) {
1370                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1371                         return;
1372                 }
1373                 if (len < ntohs(ip->ip_len)) {
1374                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1375                         return;
1376                 }
1377                 len = ntohs(ip->ip_len);
1378 #ifdef ET_DEBUG
1379                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1380 #endif
1381                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1382                         return;
1383                 }
1384                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1385                         return;
1386                 }
1387                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1388                         puts ("checksum bad\n");
1389                         return;
1390                 }
1391                 tmp = NetReadIP(&ip->ip_dst);
1392                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1393 #ifdef CONFIG_MCAST_TFTP
1394                         if (Mcast_addr != tmp) 
1395 #endif
1396                         return;
1397                 }
1398                 /*
1399                  * watch for ICMP host redirects
1400                  *
1401                  * There is no real handler code (yet). We just watch
1402                  * for ICMP host redirect messages. In case anybody
1403                  * sees these messages: please contact me
1404                  * (wd@denx.de), or - even better - send me the
1405                  * necessary fixes :-)
1406                  *
1407                  * Note: in all cases where I have seen this so far
1408                  * it was a problem with the router configuration,
1409                  * for instance when a router was configured in the
1410                  * BOOTP reply, but the TFTP server was on the same
1411                  * subnet. So this is probably a warning that your
1412                  * configuration might be wrong. But I'm not really
1413                  * sure if there aren't any other situations.
1414                  */
1415                 if (ip->ip_p == IPPROTO_ICMP) {
1416                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1417
1418                         switch (icmph->type) {
1419                         case ICMP_REDIRECT:
1420                                 if (icmph->code != ICMP_REDIR_HOST)
1421                                         return;
1422                                 puts (" ICMP Host Redirect to ");
1423                                 print_IPaddr(icmph->un.gateway);
1424                                 putc(' ');
1425                                 return;
1426 #if defined(CONFIG_CMD_PING)
1427                         case ICMP_ECHO_REPLY:
1428                                 /*
1429                                  *      IP header OK.  Pass the packet to the current handler.
1430                                  */
1431                                 /* XXX point to ip packet */
1432                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1433                                 return;
1434                         case ICMP_ECHO_REQUEST:
1435 #ifdef ET_DEBUG
1436                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1437                                         ETHER_HDR_SIZE + len);
1438 #endif
1439                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1440                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1441
1442                                 ip->ip_sum = 0;
1443                                 ip->ip_off = 0;
1444                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1445                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1446                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1447
1448                                 icmph->type = ICMP_ECHO_REPLY;
1449                                 icmph->checksum = 0;
1450                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1451                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1452                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1453                                 return;
1454 #endif
1455                         default:
1456                                 return;
1457                         }
1458                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1459                         return;
1460                 }
1461
1462 #ifdef CONFIG_UDP_CHECKSUM
1463                 if (ip->udp_xsum != 0) {
1464                         ulong   xsum;
1465                         ushort *sumptr;
1466                         ushort  sumlen;
1467
1468                         xsum  = ip->ip_p;
1469                         xsum += (ntohs(ip->udp_len));
1470                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1471                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1472                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1473                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1474
1475                         sumlen = ntohs(ip->udp_len);
1476                         sumptr = (ushort *) &(ip->udp_src);
1477
1478                         while (sumlen > 1) {
1479                                 ushort sumdata;
1480
1481                                 sumdata = *sumptr++;
1482                                 xsum += ntohs(sumdata);
1483                                 sumlen -= 2;
1484                         }
1485                         if (sumlen > 0) {
1486                                 ushort sumdata;
1487
1488                                 sumdata = *(unsigned char *) sumptr;
1489                                 sumdata = (sumdata << 8) & 0xff00;
1490                                 xsum += sumdata;
1491                         }
1492                         while ((xsum >> 16) != 0) {
1493                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1494                         }
1495                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1496                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1497                                 return;
1498                         }
1499                 }
1500 #endif
1501
1502
1503 #ifdef CONFIG_NETCONSOLE
1504                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1505                                                 ntohs(ip->udp_dst),
1506                                                 ntohs(ip->udp_src),
1507                                                 ntohs(ip->udp_len) - 8);
1508 #endif
1509                 /*
1510                  *      IP header OK.  Pass the packet to the current handler.
1511                  */
1512                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1513                                                 ntohs(ip->udp_dst),
1514                                                 ntohs(ip->udp_src),
1515                                                 ntohs(ip->udp_len) - 8);
1516                 break;
1517         }
1518 }
1519
1520
1521 /**********************************************************************/
1522
1523 static int net_check_prereq (proto_t protocol)
1524 {
1525         switch (protocol) {
1526                 /* Fall through */
1527 #if defined(CONFIG_CMD_PING)
1528         case PING:
1529                 if (NetPingIP == 0) {
1530                         puts ("*** ERROR: ping address not given\n");
1531                         return (1);
1532                 }
1533                 goto common;
1534 #endif
1535 #if defined(CONFIG_CMD_SNTP)
1536         case SNTP:
1537                 if (NetNtpServerIP == 0) {
1538                         puts ("*** ERROR: NTP server address not given\n");
1539                         return (1);
1540                 }
1541                 goto common;
1542 #endif
1543 #if defined(CONFIG_CMD_NFS)
1544         case NFS:
1545 #endif
1546         case NETCONS:
1547         case TFTP:
1548                 if (NetServerIP == 0) {
1549                         puts ("*** ERROR: `serverip' not set\n");
1550                         return (1);
1551                 }
1552 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1553     common:
1554 #endif
1555
1556                 if (NetOurIP == 0) {
1557                         puts ("*** ERROR: `ipaddr' not set\n");
1558                         return (1);
1559                 }
1560                 /* Fall through */
1561
1562         case DHCP:
1563         case RARP:
1564         case BOOTP:
1565         case CDP:
1566                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1567 #ifdef CONFIG_NET_MULTI
1568                         extern int eth_get_dev_index (void);
1569                         int num = eth_get_dev_index ();
1570
1571                         switch (num) {
1572                         case -1:
1573                                 puts ("*** ERROR: No ethernet found.\n");
1574                                 return (1);
1575                         case 0:
1576                                 puts ("*** ERROR: `ethaddr' not set\n");
1577                                 break;
1578                         default:
1579                                 printf ("*** ERROR: `eth%daddr' not set\n",
1580                                         num);
1581                                 break;
1582                         }
1583
1584                         NetStartAgain ();
1585                         return (2);
1586 #else
1587                         puts ("*** ERROR: `ethaddr' not set\n");
1588                         return (1);
1589 #endif
1590                 }
1591                 /* Fall through */
1592         default:
1593                 return (0);
1594         }
1595         return (0);             /* OK */
1596 }
1597 /**********************************************************************/
1598
1599 int
1600 NetCksumOk(uchar * ptr, int len)
1601 {
1602         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1603 }
1604
1605
1606 unsigned
1607 NetCksum(uchar * ptr, int len)
1608 {
1609         ulong   xsum;
1610         ushort *p = (ushort *)ptr;
1611
1612         xsum = 0;
1613         while (len-- > 0)
1614                 xsum += *p++;
1615         xsum = (xsum & 0xffff) + (xsum >> 16);
1616         xsum = (xsum & 0xffff) + (xsum >> 16);
1617         return (xsum & 0xffff);
1618 }
1619
1620 int
1621 NetEthHdrSize(void)
1622 {
1623         ushort myvlanid;
1624
1625         myvlanid = ntohs(NetOurVLAN);
1626         if (myvlanid == (ushort)-1)
1627                 myvlanid = VLAN_NONE;
1628
1629         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1630 }
1631
1632 int
1633 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1634 {
1635         Ethernet_t *et = (Ethernet_t *)xet;
1636         ushort myvlanid;
1637
1638         myvlanid = ntohs(NetOurVLAN);
1639         if (myvlanid == (ushort)-1)
1640                 myvlanid = VLAN_NONE;
1641
1642         memcpy (et->et_dest, addr, 6);
1643         memcpy (et->et_src, NetOurEther, 6);
1644         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1645         et->et_protlen = htons(prot);
1646                 return ETHER_HDR_SIZE;
1647         } else {
1648                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1649
1650                 vet->vet_vlan_type = htons(PROT_VLAN);
1651                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1652                 vet->vet_type = htons(prot);
1653                 return VLAN_ETHER_HDR_SIZE;
1654         }
1655 }
1656
1657 void
1658 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1659 {
1660         volatile IP_t *ip = (IP_t *)xip;
1661
1662         /*
1663          *      If the data is an odd number of bytes, zero the
1664          *      byte after the last byte so that the checksum
1665          *      will work.
1666          */
1667         if (len & 1)
1668                 xip[IP_HDR_SIZE + len] = 0;
1669
1670         /*
1671          *      Construct an IP and UDP header.
1672          *      (need to set no fragment bit - XXX)
1673          */
1674         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1675         ip->ip_tos   = 0;
1676         ip->ip_len   = htons(IP_HDR_SIZE + len);
1677         ip->ip_id    = htons(NetIPID++);
1678         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1679         ip->ip_ttl   = 255;
1680         ip->ip_p     = 17;              /* UDP */
1681         ip->ip_sum   = 0;
1682         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1683         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1684         ip->udp_src  = htons(sport);
1685         ip->udp_dst  = htons(dport);
1686         ip->udp_len  = htons(8 + len);
1687         ip->udp_xsum = 0;
1688         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1689 }
1690
1691 void copy_filename (char *dst, char *src, int size)
1692 {
1693         if (*src && (*src == '"')) {
1694                 ++src;
1695                 --size;
1696         }
1697
1698         while ((--size > 0) && *src && (*src != '"')) {
1699                 *dst++ = *src++;
1700         }
1701         *dst = '\0';
1702 }
1703
1704 #endif
1705
1706 void ip_to_string (IPaddr_t x, char *s)
1707 {
1708         x = ntohl (x);
1709         sprintf (s, "%d.%d.%d.%d",
1710                  (int) ((x >> 24) & 0xff),
1711                  (int) ((x >> 16) & 0xff),
1712                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1713         );
1714 }
1715
1716 IPaddr_t string_to_ip(char *s)
1717 {
1718         IPaddr_t addr;
1719         char *e;
1720         int i;
1721
1722         if (s == NULL)
1723                 return(0);
1724
1725         for (addr=0, i=0; i<4; ++i) {
1726                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1727                 addr <<= 8;
1728                 addr |= (val & 0xFF);
1729                 if (s) {
1730                         s = (*e) ? e+1 : e;
1731                 }
1732         }
1733
1734         return (htonl(addr));
1735 }
1736
1737 void VLAN_to_string(ushort x, char *s)
1738 {
1739         x = ntohs(x);
1740
1741         if (x == (ushort)-1)
1742                 x = VLAN_NONE;
1743
1744         if (x == VLAN_NONE)
1745                 strcpy(s, "none");
1746         else
1747                 sprintf(s, "%d", x & VLAN_IDMASK);
1748 }
1749
1750 ushort string_to_VLAN(char *s)
1751 {
1752         ushort id;
1753
1754         if (s == NULL)
1755                 return htons(VLAN_NONE);
1756
1757         if (*s < '0' || *s > '9')
1758                 id = VLAN_NONE;
1759         else
1760                 id = (ushort)simple_strtoul(s, NULL, 10);
1761
1762         return htons(id);
1763 }
1764
1765 void print_IPaddr (IPaddr_t x)
1766 {
1767         char tmp[16];
1768
1769         ip_to_string (x, tmp);
1770
1771         puts (tmp);
1772 }
1773
1774 IPaddr_t getenv_IPaddr (char *var)
1775 {
1776         return (string_to_ip(getenv(var)));
1777 }
1778
1779 ushort getenv_VLAN(char *var)
1780 {
1781         return (string_to_VLAN(getenv(var)));
1782 }