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