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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 defined(CONFIG_CMD_SNTP)
90 #include "sntp.h"
91 #endif
92 #if defined(CONFIG_CDP_VERSION)
93 #include <timestamp.h>
94 #endif
95 #if defined(CONFIG_CMD_DNS)
96 #include "dns.h"
97 #endif
98
99 #if defined(CONFIG_CMD_NET)
100
101 DECLARE_GLOBAL_DATA_PTR;
102
103 #ifndef CONFIG_ARP_TIMEOUT
104 # define ARP_TIMEOUT 5000UL /* Milliseconds before trying ARP again */
105 #else
106 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
107 #endif
108
109
110 #ifndef CONFIG_NET_RETRY_COUNT
111 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
112 #else
113 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
114 #endif
115
116 /** BOOTP EXTENTIONS **/
117
118 IPaddr_t NetOurSubnetMask=0; /* Our subnet mask (0=unknown) */
119 IPaddr_t NetOurGatewayIP=0; /* Our gateways IP address */
120 IPaddr_t NetOurDNSIP=0; /* Our DNS IP address */
121 #if defined(CONFIG_BOOTP_DNS2)
122 IPaddr_t NetOurDNS2IP=0; /* Our 2nd DNS IP address */
123 #endif
124 char NetOurNISDomain[32]={0,}; /* Our NIS domain */
125 char NetOurHostName[32]={0,}; /* Our hostname */
126 char NetOurRootPath[64]={0,}; /* Our bootpath */
127 ushort NetBootFileSize=0; /* Our bootfile size in blocks */
128
129 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
130 IPaddr_t Mcast_addr;
131 #endif
132
133 /** END OF BOOTP EXTENTIONS **/
134
135 ulong NetBootFileXferSize; /* The actual transferred size of the bootfile (in bytes) */
136 uchar NetOurEther[6]; /* Our ethernet address */
137 uchar NetServerEther[6] = /* Boot server enet address */
138 { 0, 0, 0, 0, 0, 0 };
139 IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
140 IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
141 volatile uchar *NetRxPacket; /* Current receive packet */
142 int NetRxPacketLen; /* Current rx packet length */
143 unsigned NetIPID; /* IP packet ID */
144 uchar NetBcastAddr[6] = /* Ethernet bcast address */
145 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
146 uchar NetEtherNullAddr[6] =
147 { 0, 0, 0, 0, 0, 0 };
148 #ifdef CONFIG_API
149 void (*push_packet)(volatile void *, int len) = 0;
150 #endif
151 #if defined(CONFIG_CMD_CDP)
152 uchar NetCDPAddr[6] = /* Ethernet bcast address */
153 { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
154 #endif
155 int NetState; /* Network loop state */
156 #ifdef CONFIG_NET_MULTI
157 int NetRestartWrap = 0; /* Tried all network devices */
158 static int NetRestarted = 0; /* Network loop restarted */
159 static int NetDevExists = 0; /* At least one device configured */
160 #endif
161
162 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
163 ushort NetOurVLAN = 0xFFFF; /* default is without VLAN */
164 ushort NetOurNativeVLAN = 0xFFFF; /* ditto */
165
166 char BootFile[128]; /* Boot File name */
167
168 #if defined(CONFIG_CMD_PING)
169 IPaddr_t NetPingIP; /* the ip address to ping */
170
171 static void PingStart(void);
172 #endif
173
174 #if defined(CONFIG_CMD_CDP)
175 static void CDPStart(void);
176 #endif
177
178 #if defined(CONFIG_CMD_SNTP)
179 IPaddr_t NetNtpServerIP; /* NTP server IP address */
180 int NetTimeOffset=0; /* offset time from UTC */
181 #endif
182
183 #ifdef CONFIG_NETCONSOLE
184 void NcStart(void);
185 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
186 #endif
187
188 volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
189
190 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */
191
192 static rxhand_f *packetHandler; /* Current RX packet handler */
193 static thand_f *timeHandler; /* Current timeout handler */
194 static ulong timeStart; /* Time base value */
195 static ulong timeDelta; /* Current timeout value */
196 volatile uchar *NetTxPacket = 0; /* THE transmit packet */
197
198 static int net_check_prereq (proto_t protocol);
199
200 /**********************************************************************/
201
202 IPaddr_t NetArpWaitPacketIP;
203 IPaddr_t NetArpWaitReplyIP;
204 uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */
205 uchar *NetArpWaitTxPacket; /* THE transmit packet */
206 int NetArpWaitTxPacketSize;
207 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
208 ulong NetArpWaitTimerStart;
209 int NetArpWaitTry;
210
211 void ArpRequest (void)
212 {
213 int i;
214 volatile uchar *pkt;
215 ARP_t *arp;
216
217 debug("ARP broadcast %d\n", NetArpWaitTry);
218
219 pkt = NetTxPacket;
220
221 pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
222
223 arp = (ARP_t *) pkt;
224
225 arp->ar_hrd = htons (ARP_ETHER);
226 arp->ar_pro = htons (PROT_IP);
227 arp->ar_hln = 6;
228 arp->ar_pln = 4;
229 arp->ar_op = htons (ARPOP_REQUEST);
230
231 memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
232 NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP); /* source IP addr */
233 for (i = 10; i < 16; ++i) {
234 arp->ar_data[i] = 0; /* dest ET addr = 0 */
235 }
236
237 if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
238 (NetOurIP & NetOurSubnetMask)) {
239 if (NetOurGatewayIP == 0) {
240 puts ("## Warning: gatewayip needed but not set\n");
241 NetArpWaitReplyIP = NetArpWaitPacketIP;
242 } else {
243 NetArpWaitReplyIP = NetOurGatewayIP;
244 }
245 } else {
246 NetArpWaitReplyIP = NetArpWaitPacketIP;
247 }
248
249 NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
250 (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
251 }
252
253 void ArpTimeoutCheck(void)
254 {
255 ulong t;
256
257 if (!NetArpWaitPacketIP)
258 return;
259
260 t = get_timer(0);
261
262 /* check for arp timeout */
263 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
264 NetArpWaitTry++;
265
266 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
267 puts ("\nARP Retry count exceeded; starting again\n");
268 NetArpWaitTry = 0;
269 NetStartAgain();
270 } else {
271 NetArpWaitTimerStart = t;
272 ArpRequest();
273 }
274 }
275 }
276
277 static void
278 NetInitLoop(proto_t protocol)
279 {
280 static int env_changed_id = 0;
281 bd_t *bd = gd->bd;
282 int env_id = get_env_id ();
283
284 /* update only when the environment has changed */
285 if (env_changed_id != env_id) {
286 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
287 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
288 NetOurSubnetMask= getenv_IPaddr ("netmask");
289 NetServerIP = getenv_IPaddr ("serverip");
290 NetOurNativeVLAN = getenv_VLAN("nvlan");
291 NetOurVLAN = getenv_VLAN("vlan");
292 #if defined(CONFIG_CMD_DNS)
293 NetOurDNSIP = getenv_IPaddr("dnsip");
294 #endif
295 env_changed_id = env_id;
296 }
297
298 return;
299 }
300
301 /**********************************************************************/
302 /*
303 * Main network processing loop.
304 */
305
306 int
307 NetLoop(proto_t protocol)
308 {
309 bd_t *bd = gd->bd;
310
311 #ifdef CONFIG_NET_MULTI
312 NetRestarted = 0;
313 NetDevExists = 0;
314 #endif
315
316 /* XXX problem with bss workaround */
317 NetArpWaitPacketMAC = NULL;
318 NetArpWaitTxPacket = NULL;
319 NetArpWaitPacketIP = 0;
320 NetArpWaitReplyIP = 0;
321 NetArpWaitTxPacket = NULL;
322 NetTxPacket = NULL;
323
324 if (!NetTxPacket) {
325 int i;
326 /*
327 * Setup packet buffers, aligned correctly.
328 */
329 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
330 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
331 for (i = 0; i < PKTBUFSRX; i++) {
332 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
333 }
334 }
335
336 if (!NetArpWaitTxPacket) {
337 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
338 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
339 NetArpWaitTxPacketSize = 0;
340 }
341
342 eth_halt();
343 #ifdef CONFIG_NET_MULTI
344 eth_set_current();
345 #endif
346 if (eth_init(bd) < 0) {
347 eth_halt();
348 return(-1);
349 }
350
351 restart:
352 #ifdef CONFIG_NET_MULTI
353 memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
354 #else
355 eth_getenv_enetaddr("ethaddr", NetOurEther);
356 #endif
357
358 NetState = NETLOOP_CONTINUE;
359
360 /*
361 * Start the ball rolling with the given start function. From
362 * here on, this code is a state machine driven by received
363 * packets and timer events.
364 */
365 NetInitLoop(protocol);
366
367 switch (net_check_prereq (protocol)) {
368 case 1:
369 /* network not configured */
370 eth_halt();
371 return (-1);
372
373 #ifdef CONFIG_NET_MULTI
374 case 2:
375 /* network device not configured */
376 break;
377 #endif /* CONFIG_NET_MULTI */
378
379 case 0:
380 #ifdef CONFIG_NET_MULTI
381 NetDevExists = 1;
382 #endif
383 switch (protocol) {
384 case TFTP:
385 /* always use ARP to get server ethernet address */
386 TftpStart();
387 break;
388
389 #if defined(CONFIG_CMD_DHCP)
390 case DHCP:
391 BootpTry = 0;
392 NetOurIP = 0;
393 DhcpRequest(); /* Basically same as BOOTP */
394 break;
395 #endif
396
397 case BOOTP:
398 BootpTry = 0;
399 NetOurIP = 0;
400 BootpRequest ();
401 break;
402
403 case RARP:
404 RarpTry = 0;
405 NetOurIP = 0;
406 RarpRequest ();
407 break;
408 #if defined(CONFIG_CMD_PING)
409 case PING:
410 PingStart();
411 break;
412 #endif
413 #if defined(CONFIG_CMD_NFS)
414 case NFS:
415 NfsStart();
416 break;
417 #endif
418 #if defined(CONFIG_CMD_CDP)
419 case CDP:
420 CDPStart();
421 break;
422 #endif
423 #ifdef CONFIG_NETCONSOLE
424 case NETCONS:
425 NcStart();
426 break;
427 #endif
428 #if defined(CONFIG_CMD_SNTP)
429 case SNTP:
430 SntpStart();
431 break;
432 #endif
433 #if defined(CONFIG_CMD_DNS)
434 case DNS:
435 DnsStart();
436 break;
437 #endif
438 default:
439 break;
440 }
441
442 NetBootFileXferSize = 0;
443 break;
444 }
445
446 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
447 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
448 /*
449 * Echo the inverted link state to the fault LED.
450 */
451 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
452 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
453 } else {
454 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
455 }
456 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
457 #endif /* CONFIG_MII, ... */
458
459 /*
460 * Main packet reception loop. Loop receiving packets until
461 * someone sets `NetState' to a state that terminates.
462 */
463 for (;;) {
464 WATCHDOG_RESET();
465 #ifdef CONFIG_SHOW_ACTIVITY
466 {
467 extern void show_activity(int arg);
468 show_activity(1);
469 }
470 #endif
471 /*
472 * Check the ethernet for a new packet. The ethernet
473 * receive routine will process it.
474 */
475 eth_rx();
476
477 /*
478 * Abort if ctrl-c was pressed.
479 */
480 if (ctrlc()) {
481 eth_halt();
482 puts ("\nAbort\n");
483 return (-1);
484 }
485
486 ArpTimeoutCheck();
487
488 /*
489 * Check for a timeout, and run the timeout handler
490 * if we have one.
491 */
492 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
493 thand_f *x;
494
495 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
496 # if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
497 defined(CONFIG_STATUS_LED) && \
498 defined(STATUS_LED_RED)
499 /*
500 * Echo the inverted link state to the fault LED.
501 */
502 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
503 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
504 } else {
505 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
506 }
507 # endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
508 #endif /* CONFIG_MII, ... */
509 x = timeHandler;
510 timeHandler = (thand_f *)0;
511 (*x)();
512 }
513
514
515 switch (NetState) {
516
517 case NETLOOP_RESTART:
518 #ifdef CONFIG_NET_MULTI
519 NetRestarted = 1;
520 #endif
521 goto restart;
522
523 case NETLOOP_SUCCESS:
524 if (NetBootFileXferSize > 0) {
525 char buf[20];
526 printf("Bytes transferred = %ld (%lx hex)\n",
527 NetBootFileXferSize,
528 NetBootFileXferSize);
529 sprintf(buf, "%lX", NetBootFileXferSize);
530 setenv("filesize", buf);
531
532 sprintf(buf, "%lX", (unsigned long)load_addr);
533 setenv("fileaddr", buf);
534 }
535 eth_halt();
536 return NetBootFileXferSize;
537
538 case NETLOOP_FAIL:
539 return (-1);
540 }
541 }
542 }
543
544 /**********************************************************************/
545
546 static void
547 startAgainTimeout(void)
548 {
549 NetState = NETLOOP_RESTART;
550 }
551
552 static void
553 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
554 {
555 /* Totally ignore the packet */
556 }
557
558 void NetStartAgain (void)
559 {
560 char *nretry;
561 int noretry = 0, once = 0;
562
563 if ((nretry = getenv ("netretry")) != NULL) {
564 noretry = (strcmp (nretry, "no") == 0);
565 once = (strcmp (nretry, "once") == 0);
566 }
567 if (noretry) {
568 eth_halt ();
569 NetState = NETLOOP_FAIL;
570 return;
571 }
572 #ifndef CONFIG_NET_MULTI
573 NetSetTimeout (10000UL, startAgainTimeout);
574 NetSetHandler (startAgainHandler);
575 #else /* !CONFIG_NET_MULTI*/
576 eth_halt ();
577 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
578 eth_try_another (!NetRestarted);
579 #endif
580 eth_init (gd->bd);
581 if (NetRestartWrap) {
582 NetRestartWrap = 0;
583 if (NetDevExists && !once) {
584 NetSetTimeout (10000UL, startAgainTimeout);
585 NetSetHandler (startAgainHandler);
586 } else {
587 NetState = NETLOOP_FAIL;
588 }
589 } else {
590 NetState = NETLOOP_RESTART;
591 }
592 #endif /* CONFIG_NET_MULTI */
593 }
594
595 /**********************************************************************/
596 /*
597 * Miscelaneous bits.
598 */
599
600 void
601 NetSetHandler(rxhand_f * f)
602 {
603 packetHandler = f;
604 }
605
606
607 void
608 NetSetTimeout(ulong iv, thand_f * f)
609 {
610 if (iv == 0) {
611 timeHandler = (thand_f *)0;
612 } else {
613 timeHandler = f;
614 timeStart = get_timer(0);
615 timeDelta = iv;
616 }
617 }
618
619
620 void
621 NetSendPacket(volatile uchar * pkt, int len)
622 {
623 (void) eth_send(pkt, len);
624 }
625
626 int
627 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
628 {
629 uchar *pkt;
630
631 /* convert to new style broadcast */
632 if (dest == 0)
633 dest = 0xFFFFFFFF;
634
635 /* if broadcast, make the ether address a broadcast and don't do ARP */
636 if (dest == 0xFFFFFFFF)
637 ether = NetBcastAddr;
638
639 /* if MAC address was not discovered yet, save the packet and do an ARP request */
640 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
641
642 debug("sending ARP for %08lx\n", dest);
643
644 NetArpWaitPacketIP = dest;
645 NetArpWaitPacketMAC = ether;
646
647 pkt = NetArpWaitTxPacket;
648 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
649
650 NetSetIP (pkt, dest, dport, sport, len);
651 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
652
653 /* size of the waiting packet */
654 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
655
656 /* and do the ARP request */
657 NetArpWaitTry = 1;
658 NetArpWaitTimerStart = get_timer(0);
659 ArpRequest();
660 return 1; /* waiting */
661 }
662
663 debug("sending UDP to %08lx/%pM\n", dest, ether);
664
665 pkt = (uchar *)NetTxPacket;
666 pkt += NetSetEther (pkt, ether, PROT_IP);
667 NetSetIP (pkt, dest, dport, sport, len);
668 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
669
670 return 0; /* transmitted */
671 }
672
673 #if defined(CONFIG_CMD_PING)
674 static ushort PingSeqNo;
675
676 int PingSend(void)
677 {
678 static uchar mac[6];
679 volatile IP_t *ip;
680 volatile ushort *s;
681 uchar *pkt;
682
683 /* XXX always send arp request */
684
685 memcpy(mac, NetEtherNullAddr, 6);
686
687 debug("sending ARP for %08lx\n", NetPingIP);
688
689 NetArpWaitPacketIP = NetPingIP;
690 NetArpWaitPacketMAC = mac;
691
692 pkt = NetArpWaitTxPacket;
693 pkt += NetSetEther(pkt, mac, PROT_IP);
694
695 ip = (volatile IP_t *)pkt;
696
697 /*
698 * Construct an IP and ICMP header. (need to set no fragment bit - XXX)
699 */
700 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
701 ip->ip_tos = 0;
702 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8);
703 ip->ip_id = htons(NetIPID++);
704 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
705 ip->ip_ttl = 255;
706 ip->ip_p = 0x01; /* ICMP */
707 ip->ip_sum = 0;
708 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
709 NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */
710 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
711
712 s = &ip->udp_src; /* XXX ICMP starts here */
713 s[0] = htons(0x0800); /* echo-request, code */
714 s[1] = 0; /* checksum */
715 s[2] = 0; /* identifier */
716 s[3] = htons(PingSeqNo++); /* sequence number */
717 s[1] = ~NetCksum((uchar *)s, 8/2);
718
719 /* size of the waiting packet */
720 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
721
722 /* and do the ARP request */
723 NetArpWaitTry = 1;
724 NetArpWaitTimerStart = get_timer(0);
725 ArpRequest();
726 return 1; /* waiting */
727 }
728
729 static void
730 PingTimeout (void)
731 {
732 eth_halt();
733 NetState = NETLOOP_FAIL; /* we did not get the reply */
734 }
735
736 static void
737 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
738 {
739 IPaddr_t tmp;
740 volatile IP_t *ip = (volatile IP_t *)pkt;
741
742 tmp = NetReadIP((void *)&ip->ip_src);
743 if (tmp != NetPingIP)
744 return;
745
746 NetState = NETLOOP_SUCCESS;
747 }
748
749 static void PingStart(void)
750 {
751 #if defined(CONFIG_NET_MULTI)
752 printf ("Using %s device\n", eth_get_name());
753 #endif /* CONFIG_NET_MULTI */
754 NetSetTimeout (10000UL, PingTimeout);
755 NetSetHandler (PingHandler);
756
757 PingSend();
758 }
759 #endif
760
761 #if defined(CONFIG_CMD_CDP)
762
763 #define CDP_DEVICE_ID_TLV 0x0001
764 #define CDP_ADDRESS_TLV 0x0002
765 #define CDP_PORT_ID_TLV 0x0003
766 #define CDP_CAPABILITIES_TLV 0x0004
767 #define CDP_VERSION_TLV 0x0005
768 #define CDP_PLATFORM_TLV 0x0006
769 #define CDP_NATIVE_VLAN_TLV 0x000a
770 #define CDP_APPLIANCE_VLAN_TLV 0x000e
771 #define CDP_TRIGGER_TLV 0x000f
772 #define CDP_POWER_CONSUMPTION_TLV 0x0010
773 #define CDP_SYSNAME_TLV 0x0014
774 #define CDP_SYSOBJECT_TLV 0x0015
775 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016
776
777 #define CDP_TIMEOUT 250UL /* one packet every 250ms */
778
779 static int CDPSeq;
780 static int CDPOK;
781
782 ushort CDPNativeVLAN;
783 ushort CDPApplianceVLAN;
784
785 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
786
787 static ushort CDP_compute_csum(const uchar *buff, ushort len)
788 {
789 ushort csum;
790 int odd;
791 ulong result = 0;
792 ushort leftover;
793 ushort *p;
794
795 if (len > 0) {
796 odd = 1 & (ulong)buff;
797 if (odd) {
798 result = *buff << 8;
799 len--;
800 buff++;
801 }
802 while (len > 1) {
803 p = (ushort *)buff;
804 result += *p++;
805 buff = (uchar *)p;
806 if (result & 0x80000000)
807 result = (result & 0xFFFF) + (result >> 16);
808 len -= 2;
809 }
810 if (len) {
811 leftover = (signed short)(*(const signed char *)buff);
812 /* CISCO SUCKS big time! (and blows too):
813 * CDP uses the IP checksum algorithm with a twist;
814 * for the last byte it *sign* extends and sums.
815 */
816 result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
817 }
818 while (result >> 16)
819 result = (result & 0xFFFF) + (result >> 16);
820
821 if (odd)
822 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
823 }
824
825 /* add up 16-bit and 17-bit words for 17+c bits */
826 result = (result & 0xffff) + (result >> 16);
827 /* add up 16-bit and 2-bit for 16+c bit */
828 result = (result & 0xffff) + (result >> 16);
829 /* add up carry.. */
830 result = (result & 0xffff) + (result >> 16);
831
832 /* negate */
833 csum = ~(ushort)result;
834
835 /* run time endian detection */
836 if (csum != htons(csum)) /* little endian */
837 csum = htons(csum);
838
839 return csum;
840 }
841
842 int CDPSendTrigger(void)
843 {
844 volatile uchar *pkt;
845 volatile ushort *s;
846 volatile ushort *cp;
847 Ethernet_t *et;
848 int len;
849 ushort chksum;
850 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \
851 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM)
852 char buf[32];
853 #endif
854
855 pkt = NetTxPacket;
856 et = (Ethernet_t *)pkt;
857
858 /* NOTE: trigger sent not on any VLAN */
859
860 /* form ethernet header */
861 memcpy(et->et_dest, NetCDPAddr, 6);
862 memcpy(et->et_src, NetOurEther, 6);
863
864 pkt += ETHER_HDR_SIZE;
865
866 /* SNAP header */
867 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
868 pkt += sizeof(CDP_SNAP_hdr);
869
870 /* CDP header */
871 *pkt++ = 0x02; /* CDP version 2 */
872 *pkt++ = 180; /* TTL */
873 s = (volatile ushort *)pkt;
874 cp = s;
875 *s++ = htons(0); /* checksum (0 for later calculation) */
876
877 /* CDP fields */
878 #ifdef CONFIG_CDP_DEVICE_ID
879 *s++ = htons(CDP_DEVICE_ID_TLV);
880 *s++ = htons(CONFIG_CDP_DEVICE_ID);
881 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
882 memcpy((uchar *)s, buf, 16);
883 s += 16 / 2;
884 #endif
885
886 #ifdef CONFIG_CDP_PORT_ID
887 *s++ = htons(CDP_PORT_ID_TLV);
888 memset(buf, 0, sizeof(buf));
889 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
890 len = strlen(buf);
891 if (len & 1) /* make it even */
892 len++;
893 *s++ = htons(len + 4);
894 memcpy((uchar *)s, buf, len);
895 s += len / 2;
896 #endif
897
898 #ifdef CONFIG_CDP_CAPABILITIES
899 *s++ = htons(CDP_CAPABILITIES_TLV);
900 *s++ = htons(8);
901 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
902 s += 2;
903 #endif
904
905 #ifdef CONFIG_CDP_VERSION
906 *s++ = htons(CDP_VERSION_TLV);
907 memset(buf, 0, sizeof(buf));
908 strcpy(buf, CONFIG_CDP_VERSION);
909 len = strlen(buf);
910 if (len & 1) /* make it even */
911 len++;
912 *s++ = htons(len + 4);
913 memcpy((uchar *)s, buf, len);
914 s += len / 2;
915 #endif
916
917 #ifdef CONFIG_CDP_PLATFORM
918 *s++ = htons(CDP_PLATFORM_TLV);
919 memset(buf, 0, sizeof(buf));
920 strcpy(buf, CONFIG_CDP_PLATFORM);
921 len = strlen(buf);
922 if (len & 1) /* make it even */
923 len++;
924 *s++ = htons(len + 4);
925 memcpy((uchar *)s, buf, len);
926 s += len / 2;
927 #endif
928
929 #ifdef CONFIG_CDP_TRIGGER
930 *s++ = htons(CDP_TRIGGER_TLV);
931 *s++ = htons(8);
932 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
933 s += 2;
934 #endif
935
936 #ifdef CONFIG_CDP_POWER_CONSUMPTION
937 *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
938 *s++ = htons(6);
939 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
940 #endif
941
942 /* length of ethernet packet */
943 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
944 et->et_protlen = htons(len);
945
946 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
947 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
948 if (chksum == 0)
949 chksum = 0xFFFF;
950 *cp = htons(chksum);
951
952 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
953 return 0;
954 }
955
956 static void
957 CDPTimeout (void)
958 {
959 CDPSeq++;
960
961 if (CDPSeq < 3) {
962 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
963 CDPSendTrigger();
964 return;
965 }
966
967 /* if not OK try again */
968 if (!CDPOK)
969 NetStartAgain();
970 else
971 NetState = NETLOOP_SUCCESS;
972 }
973
974 static void
975 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
976 {
977 /* nothing */
978 }
979
980 static void
981 CDPHandler(const uchar * pkt, unsigned len)
982 {
983 const uchar *t;
984 const ushort *ss;
985 ushort type, tlen;
986 uchar applid;
987 ushort vlan, nvlan;
988
989 /* minimum size? */
990 if (len < sizeof(CDP_SNAP_hdr) + 4)
991 goto pkt_short;
992
993 /* check for valid CDP SNAP header */
994 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
995 return;
996
997 pkt += sizeof(CDP_SNAP_hdr);
998 len -= sizeof(CDP_SNAP_hdr);
999
1000 /* Version of CDP protocol must be >= 2 and TTL != 0 */
1001 if (pkt[0] < 0x02 || pkt[1] == 0)
1002 return;
1003
1004 /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1005 if (pkt[0] != 0x02)
1006 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1007 pkt[0] & 0xff);
1008
1009 if (CDP_compute_csum(pkt, len) != 0)
1010 return;
1011
1012 pkt += 4;
1013 len -= 4;
1014
1015 vlan = htons(-1);
1016 nvlan = htons(-1);
1017 while (len > 0) {
1018 if (len < 4)
1019 goto pkt_short;
1020
1021 ss = (const ushort *)pkt;
1022 type = ntohs(ss[0]);
1023 tlen = ntohs(ss[1]);
1024 if (tlen > len) {
1025 goto pkt_short;
1026 }
1027
1028 pkt += tlen;
1029 len -= tlen;
1030
1031 ss += 2; /* point ss to the data of the TLV */
1032 tlen -= 4;
1033
1034 switch (type) {
1035 case CDP_DEVICE_ID_TLV:
1036 break;
1037 case CDP_ADDRESS_TLV:
1038 break;
1039 case CDP_PORT_ID_TLV:
1040 break;
1041 case CDP_CAPABILITIES_TLV:
1042 break;
1043 case CDP_VERSION_TLV:
1044 break;
1045 case CDP_PLATFORM_TLV:
1046 break;
1047 case CDP_NATIVE_VLAN_TLV:
1048 nvlan = *ss;
1049 break;
1050 case CDP_APPLIANCE_VLAN_TLV:
1051 t = (const uchar *)ss;
1052 while (tlen > 0) {
1053 if (tlen < 3)
1054 goto pkt_short;
1055
1056 applid = t[0];
1057 ss = (const ushort *)(t + 1);
1058
1059 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1060 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1061 vlan = *ss;
1062 #else
1063 vlan = ntohs(*ss); /* XXX will this work; dunno */
1064 #endif
1065 t += 3; tlen -= 3;
1066 }
1067 break;
1068 case CDP_TRIGGER_TLV:
1069 break;
1070 case CDP_POWER_CONSUMPTION_TLV:
1071 break;
1072 case CDP_SYSNAME_TLV:
1073 break;
1074 case CDP_SYSOBJECT_TLV:
1075 break;
1076 case CDP_MANAGEMENT_ADDRESS_TLV:
1077 break;
1078 }
1079 }
1080
1081 CDPApplianceVLAN = vlan;
1082 CDPNativeVLAN = nvlan;
1083
1084 CDPOK = 1;
1085 return;
1086
1087 pkt_short:
1088 printf("** CDP packet is too short\n");
1089 return;
1090 }
1091
1092 static void CDPStart(void)
1093 {
1094 #if defined(CONFIG_NET_MULTI)
1095 printf ("Using %s device\n", eth_get_name());
1096 #endif
1097 CDPSeq = 0;
1098 CDPOK = 0;
1099
1100 CDPNativeVLAN = htons(-1);
1101 CDPApplianceVLAN = htons(-1);
1102
1103 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1104 NetSetHandler (CDPDummyHandler);
1105
1106 CDPSendTrigger();
1107 }
1108 #endif
1109
1110 #ifdef CONFIG_IP_DEFRAG
1111 /*
1112 * This function collects fragments in a single packet, according
1113 * to the algorithm in RFC815. It returns NULL or the pointer to
1114 * a complete packet, in static storage
1115 */
1116 #ifndef CONFIG_NET_MAXDEFRAG
1117 #define CONFIG_NET_MAXDEFRAG 16384
1118 #endif
1119 /*
1120 * MAXDEFRAG, above, is chosen in the config file and is real data
1121 * so we need to add the NFS overhead, which is more than TFTP.
1122 * To use sizeof in the internal unnamed structures, we need a real
1123 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1124 * The compiler doesn't complain nor allocates the actual structure
1125 */
1126 static struct rpc_t rpc_specimen;
1127 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1128
1129 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1130
1131 /*
1132 * this is the packet being assembled, either data or frag control.
1133 * Fragments go by 8 bytes, so this union must be 8 bytes long
1134 */
1135 struct hole {
1136 /* first_byte is address of this structure */
1137 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
1138 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
1139 u16 prev_hole; /* index of prev, 0 == none */
1140 u16 unused;
1141 };
1142
1143 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1144 {
1145 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1146 static u16 first_hole, total_len;
1147 struct hole *payload, *thisfrag, *h, *newh;
1148 IP_t *localip = (IP_t *)pkt_buff;
1149 uchar *indata = (uchar *)ip;
1150 int offset8, start, len, done = 0;
1151 u16 ip_off = ntohs(ip->ip_off);
1152
1153 /* payload starts after IP header, this fragment is in there */
1154 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1155 offset8 = (ip_off & IP_OFFS);
1156 thisfrag = payload + offset8;
1157 start = offset8 * 8;
1158 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1159
1160 if (start + len > IP_MAXUDP) /* fragment extends too far */
1161 return NULL;
1162
1163 if (!total_len || localip->ip_id != ip->ip_id) {
1164 /* new (or different) packet, reset structs */
1165 total_len = 0xffff;
1166 payload[0].last_byte = ~0;
1167 payload[0].next_hole = 0;
1168 payload[0].prev_hole = 0;
1169 first_hole = 0;
1170 /* any IP header will work, copy the first we received */
1171 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1172 }
1173
1174 /*
1175 * What follows is the reassembly algorithm. We use the payload
1176 * array as a linked list of hole descriptors, as each hole starts
1177 * at a multiple of 8 bytes. However, last byte can be whatever value,
1178 * so it is represented as byte count, not as 8-byte blocks.
1179 */
1180
1181 h = payload + first_hole;
1182 while (h->last_byte < start) {
1183 if (!h->next_hole) {
1184 /* no hole that far away */
1185 return NULL;
1186 }
1187 h = payload + h->next_hole;
1188 }
1189
1190 if (offset8 + (len / 8) <= h - payload) {
1191 /* no overlap with holes (dup fragment?) */
1192 return NULL;
1193 }
1194
1195 if (!(ip_off & IP_FLAGS_MFRAG)) {
1196 /* no more fragmentss: truncate this (last) hole */
1197 total_len = start + len;
1198 h->last_byte = start + len;
1199 }
1200
1201 /*
1202 * There is some overlap: fix the hole list. This code doesn't
1203 * deal with a fragment that overlaps with two different holes
1204 * (thus being a superset of a previously-received fragment).
1205 */
1206
1207 if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1208 /* complete overlap with hole: remove hole */
1209 if (!h->prev_hole && !h->next_hole) {
1210 /* last remaining hole */
1211 done = 1;
1212 } else if (!h->prev_hole) {
1213 /* first hole */
1214 first_hole = h->next_hole;
1215 payload[h->next_hole].prev_hole = 0;
1216 } else if (!h->next_hole) {
1217 /* last hole */
1218 payload[h->prev_hole].next_hole = 0;
1219 } else {
1220 /* in the middle of the list */
1221 payload[h->next_hole].prev_hole = h->prev_hole;
1222 payload[h->prev_hole].next_hole = h->next_hole;
1223 }
1224
1225 } else if (h->last_byte <= start + len) {
1226 /* overlaps with final part of the hole: shorten this hole */
1227 h->last_byte = start;
1228
1229 } else if (h >= thisfrag) {
1230 /* overlaps with initial part of the hole: move this hole */
1231 newh = thisfrag + (len / 8);
1232 *newh = *h;
1233 h = newh;
1234 if (h->next_hole)
1235 payload[h->next_hole].prev_hole = (h - payload);
1236 if (h->prev_hole)
1237 payload[h->prev_hole].next_hole = (h - payload);
1238 else
1239 first_hole = (h - payload);
1240
1241 } else {
1242 /* fragment sits in the middle: split the hole */
1243 newh = thisfrag + (len / 8);
1244 *newh = *h;
1245 h->last_byte = start;
1246 h->next_hole = (newh - payload);
1247 newh->prev_hole = (h - payload);
1248 if (newh->next_hole)
1249 payload[newh->next_hole].prev_hole = (newh - payload);
1250 }
1251
1252 /* finally copy this fragment and possibly return whole packet */
1253 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1254 if (!done)
1255 return NULL;
1256
1257 localip->ip_len = htons(total_len);
1258 *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1259 return localip;
1260 }
1261
1262 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1263 {
1264 u16 ip_off = ntohs(ip->ip_off);
1265 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1266 return ip; /* not a fragment */
1267 return __NetDefragment(ip, lenp);
1268 }
1269
1270 #else /* !CONFIG_IP_DEFRAG */
1271
1272 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1273 {
1274 u16 ip_off = ntohs(ip->ip_off);
1275 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1276 return ip; /* not a fragment */
1277 return NULL;
1278 }
1279 #endif
1280
1281 void
1282 NetReceive(volatile uchar * inpkt, int len)
1283 {
1284 Ethernet_t *et;
1285 IP_t *ip;
1286 ARP_t *arp;
1287 IPaddr_t tmp;
1288 int x;
1289 uchar *pkt;
1290 #if defined(CONFIG_CMD_CDP)
1291 int iscdp;
1292 #endif
1293 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1294
1295 debug("packet received\n");
1296
1297 NetRxPacket = inpkt;
1298 NetRxPacketLen = len;
1299 et = (Ethernet_t *)inpkt;
1300
1301 /* too small packet? */
1302 if (len < ETHER_HDR_SIZE)
1303 return;
1304
1305 #ifdef CONFIG_API
1306 if (push_packet) {
1307 (*push_packet)(inpkt, len);
1308 return;
1309 }
1310 #endif
1311
1312 #if defined(CONFIG_CMD_CDP)
1313 /* keep track if packet is CDP */
1314 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1315 #endif
1316
1317 myvlanid = ntohs(NetOurVLAN);
1318 if (myvlanid == (ushort)-1)
1319 myvlanid = VLAN_NONE;
1320 mynvlanid = ntohs(NetOurNativeVLAN);
1321 if (mynvlanid == (ushort)-1)
1322 mynvlanid = VLAN_NONE;
1323
1324 x = ntohs(et->et_protlen);
1325
1326 debug("packet received\n");
1327
1328 if (x < 1514) {
1329 /*
1330 * Got a 802 packet. Check the other protocol field.
1331 */
1332 x = ntohs(et->et_prot);
1333
1334 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1335 len -= E802_HDR_SIZE;
1336
1337 } else if (x != PROT_VLAN) { /* normal packet */
1338 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1339 len -= ETHER_HDR_SIZE;
1340
1341 } else { /* VLAN packet */
1342 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1343
1344 debug("VLAN packet received\n");
1345
1346 /* too small packet? */
1347 if (len < VLAN_ETHER_HDR_SIZE)
1348 return;
1349
1350 /* if no VLAN active */
1351 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1352 #if defined(CONFIG_CMD_CDP)
1353 && iscdp == 0
1354 #endif
1355 )
1356 return;
1357
1358 cti = ntohs(vet->vet_tag);
1359 vlanid = cti & VLAN_IDMASK;
1360 x = ntohs(vet->vet_type);
1361
1362 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1363 len -= VLAN_ETHER_HDR_SIZE;
1364 }
1365
1366 debug("Receive from protocol 0x%x\n", x);
1367
1368 #if defined(CONFIG_CMD_CDP)
1369 if (iscdp) {
1370 CDPHandler((uchar *)ip, len);
1371 return;
1372 }
1373 #endif
1374
1375 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1376 if (vlanid == VLAN_NONE)
1377 vlanid = (mynvlanid & VLAN_IDMASK);
1378 /* not matched? */
1379 if (vlanid != (myvlanid & VLAN_IDMASK))
1380 return;
1381 }
1382
1383 switch (x) {
1384
1385 case PROT_ARP:
1386 /*
1387 * We have to deal with two types of ARP packets:
1388 * - REQUEST packets will be answered by sending our
1389 * IP address - if we know it.
1390 * - REPLY packates are expected only after we asked
1391 * for the TFTP server's or the gateway's ethernet
1392 * address; so if we receive such a packet, we set
1393 * the server ethernet address
1394 */
1395 debug("Got ARP\n");
1396
1397 arp = (ARP_t *)ip;
1398 if (len < ARP_HDR_SIZE) {
1399 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1400 return;
1401 }
1402 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1403 return;
1404 }
1405 if (ntohs(arp->ar_pro) != PROT_IP) {
1406 return;
1407 }
1408 if (arp->ar_hln != 6) {
1409 return;
1410 }
1411 if (arp->ar_pln != 4) {
1412 return;
1413 }
1414
1415 if (NetOurIP == 0) {
1416 return;
1417 }
1418
1419 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1420 return;
1421 }
1422
1423 switch (ntohs(arp->ar_op)) {
1424 case ARPOP_REQUEST: /* reply with our IP address */
1425 debug("Got ARP REQUEST, return our IP\n");
1426 pkt = (uchar *)et;
1427 pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1428 arp->ar_op = htons(ARPOP_REPLY);
1429 memcpy (&arp->ar_data[10], &arp->ar_data[0], 6);
1430 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1431 memcpy (&arp->ar_data[ 0], NetOurEther, 6);
1432 NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1433 (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1434 return;
1435
1436 case ARPOP_REPLY: /* arp reply */
1437 /* are we waiting for a reply */
1438 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1439 break;
1440
1441 #ifdef CONFIG_KEEP_SERVERADDR
1442 if (NetServerIP == NetArpWaitPacketIP) {
1443 char buf[20];
1444 sprintf(buf, "%pM", arp->ar_data);
1445 setenv("serveraddr", buf);
1446 }
1447 #endif
1448
1449 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1450 arp->ar_data);
1451
1452 tmp = NetReadIP(&arp->ar_data[6]);
1453
1454 /* matched waiting packet's address */
1455 if (tmp == NetArpWaitReplyIP) {
1456 debug("Got it\n");
1457 /* save address for later use */
1458 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1459
1460 #ifdef CONFIG_NETCONSOLE
1461 (*packetHandler)(0,0,0,0);
1462 #endif
1463 /* modify header, and transmit it */
1464 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1465 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1466
1467 /* no arp request pending now */
1468 NetArpWaitPacketIP = 0;
1469 NetArpWaitTxPacketSize = 0;
1470 NetArpWaitPacketMAC = NULL;
1471
1472 }
1473 return;
1474 default:
1475 debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1476 return;
1477 }
1478 break;
1479
1480 case PROT_RARP:
1481 debug("Got RARP\n");
1482 arp = (ARP_t *)ip;
1483 if (len < ARP_HDR_SIZE) {
1484 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1485 return;
1486 }
1487
1488 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1489 (ntohs(arp->ar_hrd) != ARP_ETHER) ||
1490 (ntohs(arp->ar_pro) != PROT_IP) ||
1491 (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1492
1493 puts ("invalid RARP header\n");
1494 } else {
1495 NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1496 if (NetServerIP == 0)
1497 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1498 memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1499
1500 (*packetHandler)(0,0,0,0);
1501 }
1502 break;
1503
1504 case PROT_IP:
1505 debug("Got IP\n");
1506 /* Before we start poking the header, make sure it is there */
1507 if (len < IP_HDR_SIZE) {
1508 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1509 return;
1510 }
1511 /* Check the packet length */
1512 if (len < ntohs(ip->ip_len)) {
1513 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1514 return;
1515 }
1516 len = ntohs(ip->ip_len);
1517 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1518
1519 /* Can't deal with anything except IPv4 */
1520 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1521 return;
1522 }
1523 /* Can't deal with IP options (headers != 20 bytes) */
1524 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1525 return;
1526 }
1527 /* Check the Checksum of the header */
1528 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1529 puts ("checksum bad\n");
1530 return;
1531 }
1532 /* If it is not for us, ignore it */
1533 tmp = NetReadIP(&ip->ip_dst);
1534 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1535 #ifdef CONFIG_MCAST_TFTP
1536 if (Mcast_addr != tmp)
1537 #endif
1538 return;
1539 }
1540 /*
1541 * The function returns the unchanged packet if it's not
1542 * a fragment, and either the complete packet or NULL if
1543 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1544 */
1545 if (!(ip = NetDefragment(ip, &len)))
1546 return;
1547 /*
1548 * watch for ICMP host redirects
1549 *
1550 * There is no real handler code (yet). We just watch
1551 * for ICMP host redirect messages. In case anybody
1552 * sees these messages: please contact me
1553 * (wd@denx.de), or - even better - send me the
1554 * necessary fixes :-)
1555 *
1556 * Note: in all cases where I have seen this so far
1557 * it was a problem with the router configuration,
1558 * for instance when a router was configured in the
1559 * BOOTP reply, but the TFTP server was on the same
1560 * subnet. So this is probably a warning that your
1561 * configuration might be wrong. But I'm not really
1562 * sure if there aren't any other situations.
1563 */
1564 if (ip->ip_p == IPPROTO_ICMP) {
1565 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1566
1567 switch (icmph->type) {
1568 case ICMP_REDIRECT:
1569 if (icmph->code != ICMP_REDIR_HOST)
1570 return;
1571 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1572 return;
1573 #if defined(CONFIG_CMD_PING)
1574 case ICMP_ECHO_REPLY:
1575 /*
1576 * IP header OK. Pass the packet to the current handler.
1577 */
1578 /* XXX point to ip packet */
1579 (*packetHandler)((uchar *)ip, 0, 0, 0);
1580 return;
1581 case ICMP_ECHO_REQUEST:
1582 debug("Got ICMP ECHO REQUEST, return %d bytes \n",
1583 ETHER_HDR_SIZE + len);
1584
1585 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1586 memcpy (&et->et_src[ 0], NetOurEther, 6);
1587
1588 ip->ip_sum = 0;
1589 ip->ip_off = 0;
1590 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1591 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1592 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1593
1594 icmph->type = ICMP_ECHO_REPLY;
1595 icmph->checksum = 0;
1596 icmph->checksum = ~NetCksum((uchar *)icmph,
1597 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1598 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1599 return;
1600 #endif
1601 default:
1602 return;
1603 }
1604 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1605 return;
1606 }
1607
1608 #ifdef CONFIG_UDP_CHECKSUM
1609 if (ip->udp_xsum != 0) {
1610 ulong xsum;
1611 ushort *sumptr;
1612 ushort sumlen;
1613
1614 xsum = ip->ip_p;
1615 xsum += (ntohs(ip->udp_len));
1616 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1617 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1618 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1619 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1620
1621 sumlen = ntohs(ip->udp_len);
1622 sumptr = (ushort *) &(ip->udp_src);
1623
1624 while (sumlen > 1) {
1625 ushort sumdata;
1626
1627 sumdata = *sumptr++;
1628 xsum += ntohs(sumdata);
1629 sumlen -= 2;
1630 }
1631 if (sumlen > 0) {
1632 ushort sumdata;
1633
1634 sumdata = *(unsigned char *) sumptr;
1635 sumdata = (sumdata << 8) & 0xff00;
1636 xsum += sumdata;
1637 }
1638 while ((xsum >> 16) != 0) {
1639 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1640 }
1641 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1642 printf(" UDP wrong checksum %08lx %08x\n",
1643 xsum, ntohs(ip->udp_xsum));
1644 return;
1645 }
1646 }
1647 #endif
1648
1649
1650 #ifdef CONFIG_NETCONSOLE
1651 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1652 ntohs(ip->udp_dst),
1653 ntohs(ip->udp_src),
1654 ntohs(ip->udp_len) - 8);
1655 #endif
1656 /*
1657 * IP header OK. Pass the packet to the current handler.
1658 */
1659 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1660 ntohs(ip->udp_dst),
1661 ntohs(ip->udp_src),
1662 ntohs(ip->udp_len) - 8);
1663 break;
1664 }
1665 }
1666
1667
1668 /**********************************************************************/
1669
1670 static int net_check_prereq (proto_t protocol)
1671 {
1672 switch (protocol) {
1673 /* Fall through */
1674 #if defined(CONFIG_CMD_PING)
1675 case PING:
1676 if (NetPingIP == 0) {
1677 puts ("*** ERROR: ping address not given\n");
1678 return (1);
1679 }
1680 goto common;
1681 #endif
1682 #if defined(CONFIG_CMD_SNTP)
1683 case SNTP:
1684 if (NetNtpServerIP == 0) {
1685 puts ("*** ERROR: NTP server address not given\n");
1686 return (1);
1687 }
1688 goto common;
1689 #endif
1690 #if defined(CONFIG_CMD_DNS)
1691 case DNS:
1692 if (NetOurDNSIP == 0) {
1693 puts("*** ERROR: DNS server address not given\n");
1694 return 1;
1695 }
1696 goto common;
1697 #endif
1698 #if defined(CONFIG_CMD_NFS)
1699 case NFS:
1700 #endif
1701 case NETCONS:
1702 case TFTP:
1703 if (NetServerIP == 0) {
1704 puts ("*** ERROR: `serverip' not set\n");
1705 return (1);
1706 }
1707 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1708 common:
1709 #endif
1710
1711 if (NetOurIP == 0) {
1712 puts ("*** ERROR: `ipaddr' not set\n");
1713 return (1);
1714 }
1715 /* Fall through */
1716
1717 case DHCP:
1718 case RARP:
1719 case BOOTP:
1720 case CDP:
1721 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1722 #ifdef CONFIG_NET_MULTI
1723 extern int eth_get_dev_index (void);
1724 int num = eth_get_dev_index ();
1725
1726 switch (num) {
1727 case -1:
1728 puts ("*** ERROR: No ethernet found.\n");
1729 return (1);
1730 case 0:
1731 puts ("*** ERROR: `ethaddr' not set\n");
1732 break;
1733 default:
1734 printf ("*** ERROR: `eth%daddr' not set\n",
1735 num);
1736 break;
1737 }
1738
1739 NetStartAgain ();
1740 return (2);
1741 #else
1742 puts ("*** ERROR: `ethaddr' not set\n");
1743 return (1);
1744 #endif
1745 }
1746 /* Fall through */
1747 default:
1748 return (0);
1749 }
1750 return (0); /* OK */
1751 }
1752 /**********************************************************************/
1753
1754 int
1755 NetCksumOk(uchar * ptr, int len)
1756 {
1757 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1758 }
1759
1760
1761 unsigned
1762 NetCksum(uchar * ptr, int len)
1763 {
1764 ulong xsum;
1765 ushort *p = (ushort *)ptr;
1766
1767 xsum = 0;
1768 while (len-- > 0)
1769 xsum += *p++;
1770 xsum = (xsum & 0xffff) + (xsum >> 16);
1771 xsum = (xsum & 0xffff) + (xsum >> 16);
1772 return (xsum & 0xffff);
1773 }
1774
1775 int
1776 NetEthHdrSize(void)
1777 {
1778 ushort myvlanid;
1779
1780 myvlanid = ntohs(NetOurVLAN);
1781 if (myvlanid == (ushort)-1)
1782 myvlanid = VLAN_NONE;
1783
1784 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1785 }
1786
1787 int
1788 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1789 {
1790 Ethernet_t *et = (Ethernet_t *)xet;
1791 ushort myvlanid;
1792
1793 myvlanid = ntohs(NetOurVLAN);
1794 if (myvlanid == (ushort)-1)
1795 myvlanid = VLAN_NONE;
1796
1797 memcpy (et->et_dest, addr, 6);
1798 memcpy (et->et_src, NetOurEther, 6);
1799 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1800 et->et_protlen = htons(prot);
1801 return ETHER_HDR_SIZE;
1802 } else {
1803 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1804
1805 vet->vet_vlan_type = htons(PROT_VLAN);
1806 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1807 vet->vet_type = htons(prot);
1808 return VLAN_ETHER_HDR_SIZE;
1809 }
1810 }
1811
1812 void
1813 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1814 {
1815 IP_t *ip = (IP_t *)xip;
1816
1817 /*
1818 * If the data is an odd number of bytes, zero the
1819 * byte after the last byte so that the checksum
1820 * will work.
1821 */
1822 if (len & 1)
1823 xip[IP_HDR_SIZE + len] = 0;
1824
1825 /*
1826 * Construct an IP and UDP header.
1827 * (need to set no fragment bit - XXX)
1828 */
1829 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
1830 ip->ip_tos = 0;
1831 ip->ip_len = htons(IP_HDR_SIZE + len);
1832 ip->ip_id = htons(NetIPID++);
1833 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1834 ip->ip_ttl = 255;
1835 ip->ip_p = 17; /* UDP */
1836 ip->ip_sum = 0;
1837 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1838 NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */
1839 ip->udp_src = htons(sport);
1840 ip->udp_dst = htons(dport);
1841 ip->udp_len = htons(8 + len);
1842 ip->udp_xsum = 0;
1843 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1844 }
1845
1846 void copy_filename (char *dst, char *src, int size)
1847 {
1848 if (*src && (*src == '"')) {
1849 ++src;
1850 --size;
1851 }
1852
1853 while ((--size > 0) && *src && (*src != '"')) {
1854 *dst++ = *src++;
1855 }
1856 *dst = '\0';
1857 }
1858
1859 #endif
1860
1861 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1862 /*
1863 * make port a little random, but use something trivial to compute
1864 */
1865 unsigned int random_port(void)
1866 {
1867 return 1024 + (get_timer(0) % 0x8000);;
1868 }
1869 #endif
1870
1871 void ip_to_string (IPaddr_t x, char *s)
1872 {
1873 x = ntohl (x);
1874 sprintf (s, "%d.%d.%d.%d",
1875 (int) ((x >> 24) & 0xff),
1876 (int) ((x >> 16) & 0xff),
1877 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1878 );
1879 }
1880
1881 IPaddr_t string_to_ip(char *s)
1882 {
1883 IPaddr_t addr;
1884 char *e;
1885 int i;
1886
1887 if (s == NULL)
1888 return(0);
1889
1890 for (addr=0, i=0; i<4; ++i) {
1891 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1892 addr <<= 8;
1893 addr |= (val & 0xFF);
1894 if (s) {
1895 s = (*e) ? e+1 : e;
1896 }
1897 }
1898
1899 return (htonl(addr));
1900 }
1901
1902 void VLAN_to_string(ushort x, char *s)
1903 {
1904 x = ntohs(x);
1905
1906 if (x == (ushort)-1)
1907 x = VLAN_NONE;
1908
1909 if (x == VLAN_NONE)
1910 strcpy(s, "none");
1911 else
1912 sprintf(s, "%d", x & VLAN_IDMASK);
1913 }
1914
1915 ushort string_to_VLAN(char *s)
1916 {
1917 ushort id;
1918
1919 if (s == NULL)
1920 return htons(VLAN_NONE);
1921
1922 if (*s < '0' || *s > '9')
1923 id = VLAN_NONE;
1924 else
1925 id = (ushort)simple_strtoul(s, NULL, 10);
1926
1927 return htons(id);
1928 }
1929
1930 IPaddr_t getenv_IPaddr (char *var)
1931 {
1932 return (string_to_ip(getenv(var)));
1933 }
1934
1935 ushort getenv_VLAN(char *var)
1936 {
1937 return (string_to_VLAN(getenv(var)));
1938 }
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