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[people/ms/u-boot.git] / net / net.c
1 /*
2 * Copied from Linux Monitor (LiMon) - Networking.
3 *
4 * Copyright 1994 - 2000 Neil Russell.
5 * (See License)
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9 */
10
11 /*
12 * General Desription:
13 *
14 * The user interface supports commands for BOOTP, RARP, and TFTP.
15 * Also, we support ARP internally. Depending on available data,
16 * these interact as follows:
17 *
18 * BOOTP:
19 *
20 * Prerequisites: - own ethernet address
21 * We want: - own IP address
22 * - TFTP server IP address
23 * - name of bootfile
24 * Next step: ARP
25 *
26 * RARP:
27 *
28 * Prerequisites: - own ethernet address
29 * We want: - own IP address
30 * - TFTP server IP address
31 * Next step: ARP
32 *
33 * ARP:
34 *
35 * Prerequisites: - own ethernet address
36 * - own IP address
37 * - TFTP server IP address
38 * We want: - TFTP server ethernet address
39 * Next step: TFTP
40 *
41 * DHCP:
42 *
43 * Prerequisites: - own ethernet address
44 * We want: - IP, Netmask, ServerIP, Gateway IP
45 * - bootfilename, lease time
46 * Next step: - TFTP
47 *
48 * TFTP:
49 *
50 * Prerequisites: - own ethernet address
51 * - own IP address
52 * - TFTP server IP address
53 * - TFTP server ethernet address
54 * - name of bootfile (if unknown, we use a default name
55 * derived from our own IP address)
56 * We want: - load the boot file
57 * Next step: none
58 *
59 * 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 #ifdef CONFIG_CMD_RARP
84 #include "rarp.h"
85 #endif
86 #include "nfs.h"
87 #ifdef CONFIG_STATUS_LED
88 #include <status_led.h>
89 #include <miiphy.h>
90 #endif
91 #if defined(CONFIG_CMD_SNTP)
92 #include "sntp.h"
93 #endif
94 #if defined(CONFIG_CDP_VERSION)
95 #include <timestamp.h>
96 #endif
97 #if defined(CONFIG_CMD_DNS)
98 #include "dns.h"
99 #endif
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 static int NetTryCount;
201
202 /**********************************************************************/
203
204 IPaddr_t NetArpWaitPacketIP;
205 IPaddr_t NetArpWaitReplyIP;
206 uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */
207 uchar *NetArpWaitTxPacket; /* THE transmit packet */
208 int NetArpWaitTxPacketSize;
209 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
210 ulong NetArpWaitTimerStart;
211 int NetArpWaitTry;
212
213 void ArpRequest (void)
214 {
215 int i;
216 volatile uchar *pkt;
217 ARP_t *arp;
218
219 debug("ARP broadcast %d\n", NetArpWaitTry);
220
221 pkt = NetTxPacket;
222
223 pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
224
225 arp = (ARP_t *) pkt;
226
227 arp->ar_hrd = htons (ARP_ETHER);
228 arp->ar_pro = htons (PROT_IP);
229 arp->ar_hln = 6;
230 arp->ar_pln = 4;
231 arp->ar_op = htons (ARPOP_REQUEST);
232
233 memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
234 NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP); /* source IP addr */
235 for (i = 10; i < 16; ++i) {
236 arp->ar_data[i] = 0; /* dest ET addr = 0 */
237 }
238
239 if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
240 (NetOurIP & NetOurSubnetMask)) {
241 if (NetOurGatewayIP == 0) {
242 puts ("## Warning: gatewayip needed but not set\n");
243 NetArpWaitReplyIP = NetArpWaitPacketIP;
244 } else {
245 NetArpWaitReplyIP = NetOurGatewayIP;
246 }
247 } else {
248 NetArpWaitReplyIP = NetArpWaitPacketIP;
249 }
250
251 NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
252 (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
253 }
254
255 void ArpTimeoutCheck(void)
256 {
257 ulong t;
258
259 if (!NetArpWaitPacketIP)
260 return;
261
262 t = get_timer(0);
263
264 /* check for arp timeout */
265 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
266 NetArpWaitTry++;
267
268 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
269 puts ("\nARP Retry count exceeded; starting again\n");
270 NetArpWaitTry = 0;
271 NetStartAgain();
272 } else {
273 NetArpWaitTimerStart = t;
274 ArpRequest();
275 }
276 }
277 }
278
279 static void
280 NetInitLoop(proto_t protocol)
281 {
282 static int env_changed_id = 0;
283 bd_t *bd = gd->bd;
284 int env_id = get_env_id ();
285
286 /* update only when the environment has changed */
287 if (env_changed_id != env_id) {
288 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
289 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
290 NetOurSubnetMask= getenv_IPaddr ("netmask");
291 NetServerIP = getenv_IPaddr ("serverip");
292 NetOurNativeVLAN = getenv_VLAN("nvlan");
293 NetOurVLAN = getenv_VLAN("vlan");
294 #if defined(CONFIG_CMD_DNS)
295 NetOurDNSIP = getenv_IPaddr("dnsip");
296 #endif
297 env_changed_id = env_id;
298 }
299
300 return;
301 }
302
303 /**********************************************************************/
304 /*
305 * Main network processing loop.
306 */
307
308 int
309 NetLoop(proto_t protocol)
310 {
311 bd_t *bd = gd->bd;
312
313 #ifdef CONFIG_NET_MULTI
314 NetRestarted = 0;
315 NetDevExists = 0;
316 #endif
317
318 /* XXX problem with bss workaround */
319 NetArpWaitPacketMAC = NULL;
320 NetArpWaitTxPacket = NULL;
321 NetArpWaitPacketIP = 0;
322 NetArpWaitReplyIP = 0;
323 NetArpWaitTxPacket = NULL;
324 NetTxPacket = NULL;
325 NetTryCount = 1;
326
327 if (!NetTxPacket) {
328 int i;
329 /*
330 * Setup packet buffers, aligned correctly.
331 */
332 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
333 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
334 for (i = 0; i < PKTBUFSRX; i++) {
335 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
336 }
337 }
338
339 if (!NetArpWaitTxPacket) {
340 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
341 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
342 NetArpWaitTxPacketSize = 0;
343 }
344
345 eth_halt();
346 #ifdef CONFIG_NET_MULTI
347 eth_set_current();
348 #endif
349 if (eth_init(bd) < 0) {
350 eth_halt();
351 return(-1);
352 }
353
354 restart:
355 #ifdef CONFIG_NET_MULTI
356 memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
357 #else
358 eth_getenv_enetaddr("ethaddr", NetOurEther);
359 #endif
360
361 NetState = NETLOOP_CONTINUE;
362
363 /*
364 * Start the ball rolling with the given start function. From
365 * here on, this code is a state machine driven by received
366 * packets and timer events.
367 */
368 NetInitLoop(protocol);
369
370 switch (net_check_prereq (protocol)) {
371 case 1:
372 /* network not configured */
373 eth_halt();
374 return (-1);
375
376 #ifdef CONFIG_NET_MULTI
377 case 2:
378 /* network device not configured */
379 break;
380 #endif /* CONFIG_NET_MULTI */
381
382 case 0:
383 #ifdef CONFIG_NET_MULTI
384 NetDevExists = 1;
385 #endif
386 switch (protocol) {
387 case TFTP:
388 /* always use ARP to get server ethernet address */
389 TftpStart();
390 break;
391
392 #if defined(CONFIG_CMD_DHCP)
393 case DHCP:
394 BootpTry = 0;
395 NetOurIP = 0;
396 DhcpRequest(); /* Basically same as BOOTP */
397 break;
398 #endif
399
400 case BOOTP:
401 BootpTry = 0;
402 NetOurIP = 0;
403 BootpRequest ();
404 break;
405
406 #if defined(CONFIG_CMD_RARP)
407 case RARP:
408 RarpTry = 0;
409 NetOurIP = 0;
410 RarpRequest ();
411 break;
412 #endif
413 #if defined(CONFIG_CMD_PING)
414 case PING:
415 PingStart();
416 break;
417 #endif
418 #if defined(CONFIG_CMD_NFS)
419 case NFS:
420 NfsStart();
421 break;
422 #endif
423 #if defined(CONFIG_CMD_CDP)
424 case CDP:
425 CDPStart();
426 break;
427 #endif
428 #ifdef CONFIG_NETCONSOLE
429 case NETCONS:
430 NcStart();
431 break;
432 #endif
433 #if defined(CONFIG_CMD_SNTP)
434 case SNTP:
435 SntpStart();
436 break;
437 #endif
438 #if defined(CONFIG_CMD_DNS)
439 case DNS:
440 DnsStart();
441 break;
442 #endif
443 default:
444 break;
445 }
446
447 NetBootFileXferSize = 0;
448 break;
449 }
450
451 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
452 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
453 /*
454 * Echo the inverted link state to the fault LED.
455 */
456 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
457 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
458 } else {
459 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
460 }
461 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
462 #endif /* CONFIG_MII, ... */
463
464 /*
465 * Main packet reception loop. Loop receiving packets until
466 * someone sets `NetState' to a state that terminates.
467 */
468 for (;;) {
469 WATCHDOG_RESET();
470 #ifdef CONFIG_SHOW_ACTIVITY
471 {
472 extern void show_activity(int arg);
473 show_activity(1);
474 }
475 #endif
476 /*
477 * Check the ethernet for a new packet. The ethernet
478 * receive routine will process it.
479 */
480 eth_rx();
481
482 /*
483 * Abort if ctrl-c was pressed.
484 */
485 if (ctrlc()) {
486 eth_halt();
487 puts ("\nAbort\n");
488 return (-1);
489 }
490
491 ArpTimeoutCheck();
492
493 /*
494 * Check for a timeout, and run the timeout handler
495 * if we have one.
496 */
497 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
498 thand_f *x;
499
500 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
501 # if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
502 defined(CONFIG_STATUS_LED) && \
503 defined(STATUS_LED_RED)
504 /*
505 * Echo the inverted link state to the fault LED.
506 */
507 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
508 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
509 } else {
510 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
511 }
512 # endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
513 #endif /* CONFIG_MII, ... */
514 x = timeHandler;
515 timeHandler = (thand_f *)0;
516 (*x)();
517 }
518
519
520 switch (NetState) {
521
522 case NETLOOP_RESTART:
523 #ifdef CONFIG_NET_MULTI
524 NetRestarted = 1;
525 #endif
526 goto restart;
527
528 case NETLOOP_SUCCESS:
529 if (NetBootFileXferSize > 0) {
530 char buf[20];
531 printf("Bytes transferred = %ld (%lx hex)\n",
532 NetBootFileXferSize,
533 NetBootFileXferSize);
534 sprintf(buf, "%lX", NetBootFileXferSize);
535 setenv("filesize", buf);
536
537 sprintf(buf, "%lX", (unsigned long)load_addr);
538 setenv("fileaddr", buf);
539 }
540 eth_halt();
541 return NetBootFileXferSize;
542
543 case NETLOOP_FAIL:
544 return (-1);
545 }
546 }
547 }
548
549 /**********************************************************************/
550
551 static void
552 startAgainTimeout(void)
553 {
554 NetState = NETLOOP_RESTART;
555 }
556
557 static void
558 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
559 {
560 /* Totally ignore the packet */
561 }
562
563 void NetStartAgain (void)
564 {
565 char *nretry;
566 int retry_forever = 0;
567 unsigned long retrycnt = 0;
568
569 nretry = getenv("netretry");
570 if (nretry) {
571 if (!strcmp(nretry, "yes"))
572 retry_forever = 1;
573 else if (!strcmp(nretry, "no"))
574 retrycnt = 0;
575 else if (!strcmp(nretry, "once"))
576 retrycnt = 1;
577 else
578 retrycnt = simple_strtoul(nretry, NULL, 0);
579 } else
580 retry_forever = 1;
581
582 if ((!retry_forever) && (NetTryCount >= retrycnt)) {
583 eth_halt();
584 NetState = NETLOOP_FAIL;
585 return;
586 }
587
588 NetTryCount++;
589
590 #ifndef CONFIG_NET_MULTI
591 NetSetTimeout (10000UL, startAgainTimeout);
592 NetSetHandler (startAgainHandler);
593 #else /* !CONFIG_NET_MULTI*/
594 eth_halt ();
595 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
596 eth_try_another (!NetRestarted);
597 #endif
598 eth_init (gd->bd);
599 if (NetRestartWrap) {
600 NetRestartWrap = 0;
601 if (NetDevExists) {
602 NetSetTimeout (10000UL, startAgainTimeout);
603 NetSetHandler (startAgainHandler);
604 } else {
605 NetState = NETLOOP_FAIL;
606 }
607 } else {
608 NetState = NETLOOP_RESTART;
609 }
610 #endif /* CONFIG_NET_MULTI */
611 }
612
613 /**********************************************************************/
614 /*
615 * Miscelaneous bits.
616 */
617
618 void
619 NetSetHandler(rxhand_f * f)
620 {
621 packetHandler = f;
622 }
623
624
625 void
626 NetSetTimeout(ulong iv, thand_f * f)
627 {
628 if (iv == 0) {
629 timeHandler = (thand_f *)0;
630 } else {
631 timeHandler = f;
632 timeStart = get_timer(0);
633 timeDelta = iv;
634 }
635 }
636
637
638 void
639 NetSendPacket(volatile uchar * pkt, int len)
640 {
641 (void) eth_send(pkt, len);
642 }
643
644 int
645 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
646 {
647 uchar *pkt;
648
649 /* convert to new style broadcast */
650 if (dest == 0)
651 dest = 0xFFFFFFFF;
652
653 /* if broadcast, make the ether address a broadcast and don't do ARP */
654 if (dest == 0xFFFFFFFF)
655 ether = NetBcastAddr;
656
657 /* if MAC address was not discovered yet, save the packet and do an ARP request */
658 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
659
660 debug("sending ARP for %08lx\n", dest);
661
662 NetArpWaitPacketIP = dest;
663 NetArpWaitPacketMAC = ether;
664
665 pkt = NetArpWaitTxPacket;
666 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
667
668 NetSetIP (pkt, dest, dport, sport, len);
669 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
670
671 /* size of the waiting packet */
672 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
673
674 /* and do the ARP request */
675 NetArpWaitTry = 1;
676 NetArpWaitTimerStart = get_timer(0);
677 ArpRequest();
678 return 1; /* waiting */
679 }
680
681 debug("sending UDP to %08lx/%pM\n", dest, ether);
682
683 pkt = (uchar *)NetTxPacket;
684 pkt += NetSetEther (pkt, ether, PROT_IP);
685 NetSetIP (pkt, dest, dport, sport, len);
686 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
687
688 return 0; /* transmitted */
689 }
690
691 #if defined(CONFIG_CMD_PING)
692 static ushort PingSeqNo;
693
694 int PingSend(void)
695 {
696 static uchar mac[6];
697 volatile IP_t *ip;
698 volatile ushort *s;
699 uchar *pkt;
700
701 /* XXX always send arp request */
702
703 memcpy(mac, NetEtherNullAddr, 6);
704
705 debug("sending ARP for %08lx\n", NetPingIP);
706
707 NetArpWaitPacketIP = NetPingIP;
708 NetArpWaitPacketMAC = mac;
709
710 pkt = NetArpWaitTxPacket;
711 pkt += NetSetEther(pkt, mac, PROT_IP);
712
713 ip = (volatile IP_t *)pkt;
714
715 /*
716 * Construct an IP and ICMP header. (need to set no fragment bit - XXX)
717 */
718 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
719 ip->ip_tos = 0;
720 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8);
721 ip->ip_id = htons(NetIPID++);
722 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
723 ip->ip_ttl = 255;
724 ip->ip_p = 0x01; /* ICMP */
725 ip->ip_sum = 0;
726 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
727 NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */
728 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
729
730 s = &ip->udp_src; /* XXX ICMP starts here */
731 s[0] = htons(0x0800); /* echo-request, code */
732 s[1] = 0; /* checksum */
733 s[2] = 0; /* identifier */
734 s[3] = htons(PingSeqNo++); /* sequence number */
735 s[1] = ~NetCksum((uchar *)s, 8/2);
736
737 /* size of the waiting packet */
738 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
739
740 /* and do the ARP request */
741 NetArpWaitTry = 1;
742 NetArpWaitTimerStart = get_timer(0);
743 ArpRequest();
744 return 1; /* waiting */
745 }
746
747 static void
748 PingTimeout (void)
749 {
750 eth_halt();
751 NetState = NETLOOP_FAIL; /* we did not get the reply */
752 }
753
754 static void
755 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
756 {
757 IPaddr_t tmp;
758 volatile IP_t *ip = (volatile IP_t *)pkt;
759
760 tmp = NetReadIP((void *)&ip->ip_src);
761 if (tmp != NetPingIP)
762 return;
763
764 NetState = NETLOOP_SUCCESS;
765 }
766
767 static void PingStart(void)
768 {
769 #if defined(CONFIG_NET_MULTI)
770 printf ("Using %s device\n", eth_get_name());
771 #endif /* CONFIG_NET_MULTI */
772 NetSetTimeout (10000UL, PingTimeout);
773 NetSetHandler (PingHandler);
774
775 PingSend();
776 }
777 #endif
778
779 #if defined(CONFIG_CMD_CDP)
780
781 #define CDP_DEVICE_ID_TLV 0x0001
782 #define CDP_ADDRESS_TLV 0x0002
783 #define CDP_PORT_ID_TLV 0x0003
784 #define CDP_CAPABILITIES_TLV 0x0004
785 #define CDP_VERSION_TLV 0x0005
786 #define CDP_PLATFORM_TLV 0x0006
787 #define CDP_NATIVE_VLAN_TLV 0x000a
788 #define CDP_APPLIANCE_VLAN_TLV 0x000e
789 #define CDP_TRIGGER_TLV 0x000f
790 #define CDP_POWER_CONSUMPTION_TLV 0x0010
791 #define CDP_SYSNAME_TLV 0x0014
792 #define CDP_SYSOBJECT_TLV 0x0015
793 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016
794
795 #define CDP_TIMEOUT 250UL /* one packet every 250ms */
796
797 static int CDPSeq;
798 static int CDPOK;
799
800 ushort CDPNativeVLAN;
801 ushort CDPApplianceVLAN;
802
803 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
804
805 static ushort CDP_compute_csum(const uchar *buff, ushort len)
806 {
807 ushort csum;
808 int odd;
809 ulong result = 0;
810 ushort leftover;
811 ushort *p;
812
813 if (len > 0) {
814 odd = 1 & (ulong)buff;
815 if (odd) {
816 result = *buff << 8;
817 len--;
818 buff++;
819 }
820 while (len > 1) {
821 p = (ushort *)buff;
822 result += *p++;
823 buff = (uchar *)p;
824 if (result & 0x80000000)
825 result = (result & 0xFFFF) + (result >> 16);
826 len -= 2;
827 }
828 if (len) {
829 leftover = (signed short)(*(const signed char *)buff);
830 /* CISCO SUCKS big time! (and blows too):
831 * CDP uses the IP checksum algorithm with a twist;
832 * for the last byte it *sign* extends and sums.
833 */
834 result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
835 }
836 while (result >> 16)
837 result = (result & 0xFFFF) + (result >> 16);
838
839 if (odd)
840 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
841 }
842
843 /* add up 16-bit and 17-bit words for 17+c bits */
844 result = (result & 0xffff) + (result >> 16);
845 /* add up 16-bit and 2-bit for 16+c bit */
846 result = (result & 0xffff) + (result >> 16);
847 /* add up carry.. */
848 result = (result & 0xffff) + (result >> 16);
849
850 /* negate */
851 csum = ~(ushort)result;
852
853 /* run time endian detection */
854 if (csum != htons(csum)) /* little endian */
855 csum = htons(csum);
856
857 return csum;
858 }
859
860 int CDPSendTrigger(void)
861 {
862 volatile uchar *pkt;
863 volatile ushort *s;
864 volatile ushort *cp;
865 Ethernet_t *et;
866 int len;
867 ushort chksum;
868 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \
869 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM)
870 char buf[32];
871 #endif
872
873 pkt = NetTxPacket;
874 et = (Ethernet_t *)pkt;
875
876 /* NOTE: trigger sent not on any VLAN */
877
878 /* form ethernet header */
879 memcpy(et->et_dest, NetCDPAddr, 6);
880 memcpy(et->et_src, NetOurEther, 6);
881
882 pkt += ETHER_HDR_SIZE;
883
884 /* SNAP header */
885 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
886 pkt += sizeof(CDP_SNAP_hdr);
887
888 /* CDP header */
889 *pkt++ = 0x02; /* CDP version 2 */
890 *pkt++ = 180; /* TTL */
891 s = (volatile ushort *)pkt;
892 cp = s;
893 *s++ = htons(0); /* checksum (0 for later calculation) */
894
895 /* CDP fields */
896 #ifdef CONFIG_CDP_DEVICE_ID
897 *s++ = htons(CDP_DEVICE_ID_TLV);
898 *s++ = htons(CONFIG_CDP_DEVICE_ID);
899 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
900 memcpy((uchar *)s, buf, 16);
901 s += 16 / 2;
902 #endif
903
904 #ifdef CONFIG_CDP_PORT_ID
905 *s++ = htons(CDP_PORT_ID_TLV);
906 memset(buf, 0, sizeof(buf));
907 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
908 len = strlen(buf);
909 if (len & 1) /* make it even */
910 len++;
911 *s++ = htons(len + 4);
912 memcpy((uchar *)s, buf, len);
913 s += len / 2;
914 #endif
915
916 #ifdef CONFIG_CDP_CAPABILITIES
917 *s++ = htons(CDP_CAPABILITIES_TLV);
918 *s++ = htons(8);
919 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
920 s += 2;
921 #endif
922
923 #ifdef CONFIG_CDP_VERSION
924 *s++ = htons(CDP_VERSION_TLV);
925 memset(buf, 0, sizeof(buf));
926 strcpy(buf, CONFIG_CDP_VERSION);
927 len = strlen(buf);
928 if (len & 1) /* make it even */
929 len++;
930 *s++ = htons(len + 4);
931 memcpy((uchar *)s, buf, len);
932 s += len / 2;
933 #endif
934
935 #ifdef CONFIG_CDP_PLATFORM
936 *s++ = htons(CDP_PLATFORM_TLV);
937 memset(buf, 0, sizeof(buf));
938 strcpy(buf, CONFIG_CDP_PLATFORM);
939 len = strlen(buf);
940 if (len & 1) /* make it even */
941 len++;
942 *s++ = htons(len + 4);
943 memcpy((uchar *)s, buf, len);
944 s += len / 2;
945 #endif
946
947 #ifdef CONFIG_CDP_TRIGGER
948 *s++ = htons(CDP_TRIGGER_TLV);
949 *s++ = htons(8);
950 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
951 s += 2;
952 #endif
953
954 #ifdef CONFIG_CDP_POWER_CONSUMPTION
955 *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
956 *s++ = htons(6);
957 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
958 #endif
959
960 /* length of ethernet packet */
961 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
962 et->et_protlen = htons(len);
963
964 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
965 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
966 if (chksum == 0)
967 chksum = 0xFFFF;
968 *cp = htons(chksum);
969
970 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
971 return 0;
972 }
973
974 static void
975 CDPTimeout (void)
976 {
977 CDPSeq++;
978
979 if (CDPSeq < 3) {
980 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
981 CDPSendTrigger();
982 return;
983 }
984
985 /* if not OK try again */
986 if (!CDPOK)
987 NetStartAgain();
988 else
989 NetState = NETLOOP_SUCCESS;
990 }
991
992 static void
993 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
994 {
995 /* nothing */
996 }
997
998 static void
999 CDPHandler(const uchar * pkt, unsigned len)
1000 {
1001 const uchar *t;
1002 const ushort *ss;
1003 ushort type, tlen;
1004 uchar applid;
1005 ushort vlan, nvlan;
1006
1007 /* minimum size? */
1008 if (len < sizeof(CDP_SNAP_hdr) + 4)
1009 goto pkt_short;
1010
1011 /* check for valid CDP SNAP header */
1012 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1013 return;
1014
1015 pkt += sizeof(CDP_SNAP_hdr);
1016 len -= sizeof(CDP_SNAP_hdr);
1017
1018 /* Version of CDP protocol must be >= 2 and TTL != 0 */
1019 if (pkt[0] < 0x02 || pkt[1] == 0)
1020 return;
1021
1022 /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1023 if (pkt[0] != 0x02)
1024 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1025 pkt[0] & 0xff);
1026
1027 if (CDP_compute_csum(pkt, len) != 0)
1028 return;
1029
1030 pkt += 4;
1031 len -= 4;
1032
1033 vlan = htons(-1);
1034 nvlan = htons(-1);
1035 while (len > 0) {
1036 if (len < 4)
1037 goto pkt_short;
1038
1039 ss = (const ushort *)pkt;
1040 type = ntohs(ss[0]);
1041 tlen = ntohs(ss[1]);
1042 if (tlen > len) {
1043 goto pkt_short;
1044 }
1045
1046 pkt += tlen;
1047 len -= tlen;
1048
1049 ss += 2; /* point ss to the data of the TLV */
1050 tlen -= 4;
1051
1052 switch (type) {
1053 case CDP_DEVICE_ID_TLV:
1054 break;
1055 case CDP_ADDRESS_TLV:
1056 break;
1057 case CDP_PORT_ID_TLV:
1058 break;
1059 case CDP_CAPABILITIES_TLV:
1060 break;
1061 case CDP_VERSION_TLV:
1062 break;
1063 case CDP_PLATFORM_TLV:
1064 break;
1065 case CDP_NATIVE_VLAN_TLV:
1066 nvlan = *ss;
1067 break;
1068 case CDP_APPLIANCE_VLAN_TLV:
1069 t = (const uchar *)ss;
1070 while (tlen > 0) {
1071 if (tlen < 3)
1072 goto pkt_short;
1073
1074 applid = t[0];
1075 ss = (const ushort *)(t + 1);
1076
1077 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1078 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1079 vlan = *ss;
1080 #else
1081 vlan = ntohs(*ss); /* XXX will this work; dunno */
1082 #endif
1083 t += 3; tlen -= 3;
1084 }
1085 break;
1086 case CDP_TRIGGER_TLV:
1087 break;
1088 case CDP_POWER_CONSUMPTION_TLV:
1089 break;
1090 case CDP_SYSNAME_TLV:
1091 break;
1092 case CDP_SYSOBJECT_TLV:
1093 break;
1094 case CDP_MANAGEMENT_ADDRESS_TLV:
1095 break;
1096 }
1097 }
1098
1099 CDPApplianceVLAN = vlan;
1100 CDPNativeVLAN = nvlan;
1101
1102 CDPOK = 1;
1103 return;
1104
1105 pkt_short:
1106 printf("** CDP packet is too short\n");
1107 return;
1108 }
1109
1110 static void CDPStart(void)
1111 {
1112 #if defined(CONFIG_NET_MULTI)
1113 printf ("Using %s device\n", eth_get_name());
1114 #endif
1115 CDPSeq = 0;
1116 CDPOK = 0;
1117
1118 CDPNativeVLAN = htons(-1);
1119 CDPApplianceVLAN = htons(-1);
1120
1121 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1122 NetSetHandler (CDPDummyHandler);
1123
1124 CDPSendTrigger();
1125 }
1126 #endif
1127
1128 #ifdef CONFIG_IP_DEFRAG
1129 /*
1130 * This function collects fragments in a single packet, according
1131 * to the algorithm in RFC815. It returns NULL or the pointer to
1132 * a complete packet, in static storage
1133 */
1134 #ifndef CONFIG_NET_MAXDEFRAG
1135 #define CONFIG_NET_MAXDEFRAG 16384
1136 #endif
1137 /*
1138 * MAXDEFRAG, above, is chosen in the config file and is real data
1139 * so we need to add the NFS overhead, which is more than TFTP.
1140 * To use sizeof in the internal unnamed structures, we need a real
1141 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1142 * The compiler doesn't complain nor allocates the actual structure
1143 */
1144 static struct rpc_t rpc_specimen;
1145 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1146
1147 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1148
1149 /*
1150 * this is the packet being assembled, either data or frag control.
1151 * Fragments go by 8 bytes, so this union must be 8 bytes long
1152 */
1153 struct hole {
1154 /* first_byte is address of this structure */
1155 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
1156 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
1157 u16 prev_hole; /* index of prev, 0 == none */
1158 u16 unused;
1159 };
1160
1161 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1162 {
1163 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1164 static u16 first_hole, total_len;
1165 struct hole *payload, *thisfrag, *h, *newh;
1166 IP_t *localip = (IP_t *)pkt_buff;
1167 uchar *indata = (uchar *)ip;
1168 int offset8, start, len, done = 0;
1169 u16 ip_off = ntohs(ip->ip_off);
1170
1171 /* payload starts after IP header, this fragment is in there */
1172 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1173 offset8 = (ip_off & IP_OFFS);
1174 thisfrag = payload + offset8;
1175 start = offset8 * 8;
1176 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1177
1178 if (start + len > IP_MAXUDP) /* fragment extends too far */
1179 return NULL;
1180
1181 if (!total_len || localip->ip_id != ip->ip_id) {
1182 /* new (or different) packet, reset structs */
1183 total_len = 0xffff;
1184 payload[0].last_byte = ~0;
1185 payload[0].next_hole = 0;
1186 payload[0].prev_hole = 0;
1187 first_hole = 0;
1188 /* any IP header will work, copy the first we received */
1189 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1190 }
1191
1192 /*
1193 * What follows is the reassembly algorithm. We use the payload
1194 * array as a linked list of hole descriptors, as each hole starts
1195 * at a multiple of 8 bytes. However, last byte can be whatever value,
1196 * so it is represented as byte count, not as 8-byte blocks.
1197 */
1198
1199 h = payload + first_hole;
1200 while (h->last_byte < start) {
1201 if (!h->next_hole) {
1202 /* no hole that far away */
1203 return NULL;
1204 }
1205 h = payload + h->next_hole;
1206 }
1207
1208 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1209 if (offset8 + ((len + 7) / 8) <= h - payload) {
1210 /* no overlap with holes (dup fragment?) */
1211 return NULL;
1212 }
1213
1214 if (!(ip_off & IP_FLAGS_MFRAG)) {
1215 /* no more fragmentss: truncate this (last) hole */
1216 total_len = start + len;
1217 h->last_byte = start + len;
1218 }
1219
1220 /*
1221 * There is some overlap: fix the hole list. This code doesn't
1222 * deal with a fragment that overlaps with two different holes
1223 * (thus being a superset of a previously-received fragment).
1224 */
1225
1226 if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1227 /* complete overlap with hole: remove hole */
1228 if (!h->prev_hole && !h->next_hole) {
1229 /* last remaining hole */
1230 done = 1;
1231 } else if (!h->prev_hole) {
1232 /* first hole */
1233 first_hole = h->next_hole;
1234 payload[h->next_hole].prev_hole = 0;
1235 } else if (!h->next_hole) {
1236 /* last hole */
1237 payload[h->prev_hole].next_hole = 0;
1238 } else {
1239 /* in the middle of the list */
1240 payload[h->next_hole].prev_hole = h->prev_hole;
1241 payload[h->prev_hole].next_hole = h->next_hole;
1242 }
1243
1244 } else if (h->last_byte <= start + len) {
1245 /* overlaps with final part of the hole: shorten this hole */
1246 h->last_byte = start;
1247
1248 } else if (h >= thisfrag) {
1249 /* overlaps with initial part of the hole: move this hole */
1250 newh = thisfrag + (len / 8);
1251 *newh = *h;
1252 h = newh;
1253 if (h->next_hole)
1254 payload[h->next_hole].prev_hole = (h - payload);
1255 if (h->prev_hole)
1256 payload[h->prev_hole].next_hole = (h - payload);
1257 else
1258 first_hole = (h - payload);
1259
1260 } else {
1261 /* fragment sits in the middle: split the hole */
1262 newh = thisfrag + (len / 8);
1263 *newh = *h;
1264 h->last_byte = start;
1265 h->next_hole = (newh - payload);
1266 newh->prev_hole = (h - payload);
1267 if (newh->next_hole)
1268 payload[newh->next_hole].prev_hole = (newh - payload);
1269 }
1270
1271 /* finally copy this fragment and possibly return whole packet */
1272 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1273 if (!done)
1274 return NULL;
1275
1276 localip->ip_len = htons(total_len);
1277 *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1278 return localip;
1279 }
1280
1281 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1282 {
1283 u16 ip_off = ntohs(ip->ip_off);
1284 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1285 return ip; /* not a fragment */
1286 return __NetDefragment(ip, lenp);
1287 }
1288
1289 #else /* !CONFIG_IP_DEFRAG */
1290
1291 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1292 {
1293 u16 ip_off = ntohs(ip->ip_off);
1294 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1295 return ip; /* not a fragment */
1296 return NULL;
1297 }
1298 #endif
1299
1300 void
1301 NetReceive(volatile uchar * inpkt, int len)
1302 {
1303 Ethernet_t *et;
1304 IP_t *ip;
1305 ARP_t *arp;
1306 IPaddr_t tmp;
1307 int x;
1308 uchar *pkt;
1309 #if defined(CONFIG_CMD_CDP)
1310 int iscdp;
1311 #endif
1312 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1313
1314 debug("packet received\n");
1315
1316 NetRxPacket = inpkt;
1317 NetRxPacketLen = len;
1318 et = (Ethernet_t *)inpkt;
1319
1320 /* too small packet? */
1321 if (len < ETHER_HDR_SIZE)
1322 return;
1323
1324 #ifdef CONFIG_API
1325 if (push_packet) {
1326 (*push_packet)(inpkt, len);
1327 return;
1328 }
1329 #endif
1330
1331 #if defined(CONFIG_CMD_CDP)
1332 /* keep track if packet is CDP */
1333 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1334 #endif
1335
1336 myvlanid = ntohs(NetOurVLAN);
1337 if (myvlanid == (ushort)-1)
1338 myvlanid = VLAN_NONE;
1339 mynvlanid = ntohs(NetOurNativeVLAN);
1340 if (mynvlanid == (ushort)-1)
1341 mynvlanid = VLAN_NONE;
1342
1343 x = ntohs(et->et_protlen);
1344
1345 debug("packet received\n");
1346
1347 if (x < 1514) {
1348 /*
1349 * Got a 802 packet. Check the other protocol field.
1350 */
1351 x = ntohs(et->et_prot);
1352
1353 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1354 len -= E802_HDR_SIZE;
1355
1356 } else if (x != PROT_VLAN) { /* normal packet */
1357 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1358 len -= ETHER_HDR_SIZE;
1359
1360 } else { /* VLAN packet */
1361 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1362
1363 debug("VLAN packet received\n");
1364
1365 /* too small packet? */
1366 if (len < VLAN_ETHER_HDR_SIZE)
1367 return;
1368
1369 /* if no VLAN active */
1370 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1371 #if defined(CONFIG_CMD_CDP)
1372 && iscdp == 0
1373 #endif
1374 )
1375 return;
1376
1377 cti = ntohs(vet->vet_tag);
1378 vlanid = cti & VLAN_IDMASK;
1379 x = ntohs(vet->vet_type);
1380
1381 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1382 len -= VLAN_ETHER_HDR_SIZE;
1383 }
1384
1385 debug("Receive from protocol 0x%x\n", x);
1386
1387 #if defined(CONFIG_CMD_CDP)
1388 if (iscdp) {
1389 CDPHandler((uchar *)ip, len);
1390 return;
1391 }
1392 #endif
1393
1394 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1395 if (vlanid == VLAN_NONE)
1396 vlanid = (mynvlanid & VLAN_IDMASK);
1397 /* not matched? */
1398 if (vlanid != (myvlanid & VLAN_IDMASK))
1399 return;
1400 }
1401
1402 switch (x) {
1403
1404 case PROT_ARP:
1405 /*
1406 * We have to deal with two types of ARP packets:
1407 * - REQUEST packets will be answered by sending our
1408 * IP address - if we know it.
1409 * - REPLY packates are expected only after we asked
1410 * for the TFTP server's or the gateway's ethernet
1411 * address; so if we receive such a packet, we set
1412 * the server ethernet address
1413 */
1414 debug("Got ARP\n");
1415
1416 arp = (ARP_t *)ip;
1417 if (len < ARP_HDR_SIZE) {
1418 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1419 return;
1420 }
1421 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1422 return;
1423 }
1424 if (ntohs(arp->ar_pro) != PROT_IP) {
1425 return;
1426 }
1427 if (arp->ar_hln != 6) {
1428 return;
1429 }
1430 if (arp->ar_pln != 4) {
1431 return;
1432 }
1433
1434 if (NetOurIP == 0) {
1435 return;
1436 }
1437
1438 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1439 return;
1440 }
1441
1442 switch (ntohs(arp->ar_op)) {
1443 case ARPOP_REQUEST: /* reply with our IP address */
1444 debug("Got ARP REQUEST, return our IP\n");
1445 pkt = (uchar *)et;
1446 pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1447 arp->ar_op = htons(ARPOP_REPLY);
1448 memcpy (&arp->ar_data[10], &arp->ar_data[0], 6);
1449 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1450 memcpy (&arp->ar_data[ 0], NetOurEther, 6);
1451 NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1452 (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1453 return;
1454
1455 case ARPOP_REPLY: /* arp reply */
1456 /* are we waiting for a reply */
1457 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1458 break;
1459
1460 #ifdef CONFIG_KEEP_SERVERADDR
1461 if (NetServerIP == NetArpWaitPacketIP) {
1462 char buf[20];
1463 sprintf(buf, "%pM", arp->ar_data);
1464 setenv("serveraddr", buf);
1465 }
1466 #endif
1467
1468 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1469 arp->ar_data);
1470
1471 tmp = NetReadIP(&arp->ar_data[6]);
1472
1473 /* matched waiting packet's address */
1474 if (tmp == NetArpWaitReplyIP) {
1475 debug("Got it\n");
1476 /* save address for later use */
1477 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1478
1479 #ifdef CONFIG_NETCONSOLE
1480 (*packetHandler)(0,0,0,0);
1481 #endif
1482 /* modify header, and transmit it */
1483 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1484 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1485
1486 /* no arp request pending now */
1487 NetArpWaitPacketIP = 0;
1488 NetArpWaitTxPacketSize = 0;
1489 NetArpWaitPacketMAC = NULL;
1490
1491 }
1492 return;
1493 default:
1494 debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1495 return;
1496 }
1497 break;
1498
1499 #ifdef CONFIG_CMD_RARP
1500 case PROT_RARP:
1501 debug("Got RARP\n");
1502 arp = (ARP_t *)ip;
1503 if (len < ARP_HDR_SIZE) {
1504 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1505 return;
1506 }
1507
1508 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1509 (ntohs(arp->ar_hrd) != ARP_ETHER) ||
1510 (ntohs(arp->ar_pro) != PROT_IP) ||
1511 (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1512
1513 puts ("invalid RARP header\n");
1514 } else {
1515 NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1516 if (NetServerIP == 0)
1517 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1518 memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1519
1520 (*packetHandler)(0,0,0,0);
1521 }
1522 break;
1523 #endif
1524 case PROT_IP:
1525 debug("Got IP\n");
1526 /* Before we start poking the header, make sure it is there */
1527 if (len < IP_HDR_SIZE) {
1528 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1529 return;
1530 }
1531 /* Check the packet length */
1532 if (len < ntohs(ip->ip_len)) {
1533 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1534 return;
1535 }
1536 len = ntohs(ip->ip_len);
1537 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1538
1539 /* Can't deal with anything except IPv4 */
1540 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1541 return;
1542 }
1543 /* Can't deal with IP options (headers != 20 bytes) */
1544 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1545 return;
1546 }
1547 /* Check the Checksum of the header */
1548 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1549 puts ("checksum bad\n");
1550 return;
1551 }
1552 /* If it is not for us, ignore it */
1553 tmp = NetReadIP(&ip->ip_dst);
1554 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1555 #ifdef CONFIG_MCAST_TFTP
1556 if (Mcast_addr != tmp)
1557 #endif
1558 return;
1559 }
1560 /*
1561 * The function returns the unchanged packet if it's not
1562 * a fragment, and either the complete packet or NULL if
1563 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1564 */
1565 if (!(ip = NetDefragment(ip, &len)))
1566 return;
1567 /*
1568 * watch for ICMP host redirects
1569 *
1570 * There is no real handler code (yet). We just watch
1571 * for ICMP host redirect messages. In case anybody
1572 * sees these messages: please contact me
1573 * (wd@denx.de), or - even better - send me the
1574 * necessary fixes :-)
1575 *
1576 * Note: in all cases where I have seen this so far
1577 * it was a problem with the router configuration,
1578 * for instance when a router was configured in the
1579 * BOOTP reply, but the TFTP server was on the same
1580 * subnet. So this is probably a warning that your
1581 * configuration might be wrong. But I'm not really
1582 * sure if there aren't any other situations.
1583 */
1584 if (ip->ip_p == IPPROTO_ICMP) {
1585 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1586
1587 switch (icmph->type) {
1588 case ICMP_REDIRECT:
1589 if (icmph->code != ICMP_REDIR_HOST)
1590 return;
1591 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1592 return;
1593 #if defined(CONFIG_CMD_PING)
1594 case ICMP_ECHO_REPLY:
1595 /*
1596 * IP header OK. Pass the packet to the current handler.
1597 */
1598 /* XXX point to ip packet */
1599 (*packetHandler)((uchar *)ip, 0, 0, 0);
1600 return;
1601 case ICMP_ECHO_REQUEST:
1602 debug("Got ICMP ECHO REQUEST, return %d bytes \n",
1603 ETHER_HDR_SIZE + len);
1604
1605 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1606 memcpy (&et->et_src[ 0], NetOurEther, 6);
1607
1608 ip->ip_sum = 0;
1609 ip->ip_off = 0;
1610 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1611 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1612 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1613
1614 icmph->type = ICMP_ECHO_REPLY;
1615 icmph->checksum = 0;
1616 icmph->checksum = ~NetCksum((uchar *)icmph,
1617 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1618 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1619 return;
1620 #endif
1621 default:
1622 return;
1623 }
1624 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1625 return;
1626 }
1627
1628 #ifdef CONFIG_UDP_CHECKSUM
1629 if (ip->udp_xsum != 0) {
1630 ulong xsum;
1631 ushort *sumptr;
1632 ushort sumlen;
1633
1634 xsum = ip->ip_p;
1635 xsum += (ntohs(ip->udp_len));
1636 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1637 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1638 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1639 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1640
1641 sumlen = ntohs(ip->udp_len);
1642 sumptr = (ushort *) &(ip->udp_src);
1643
1644 while (sumlen > 1) {
1645 ushort sumdata;
1646
1647 sumdata = *sumptr++;
1648 xsum += ntohs(sumdata);
1649 sumlen -= 2;
1650 }
1651 if (sumlen > 0) {
1652 ushort sumdata;
1653
1654 sumdata = *(unsigned char *) sumptr;
1655 sumdata = (sumdata << 8) & 0xff00;
1656 xsum += sumdata;
1657 }
1658 while ((xsum >> 16) != 0) {
1659 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1660 }
1661 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1662 printf(" UDP wrong checksum %08lx %08x\n",
1663 xsum, ntohs(ip->udp_xsum));
1664 return;
1665 }
1666 }
1667 #endif
1668
1669
1670 #ifdef CONFIG_NETCONSOLE
1671 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1672 ntohs(ip->udp_dst),
1673 ntohs(ip->udp_src),
1674 ntohs(ip->udp_len) - 8);
1675 #endif
1676 /*
1677 * IP header OK. Pass the packet to the current handler.
1678 */
1679 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1680 ntohs(ip->udp_dst),
1681 ntohs(ip->udp_src),
1682 ntohs(ip->udp_len) - 8);
1683 break;
1684 }
1685 }
1686
1687
1688 /**********************************************************************/
1689
1690 static int net_check_prereq (proto_t protocol)
1691 {
1692 switch (protocol) {
1693 /* Fall through */
1694 #if defined(CONFIG_CMD_PING)
1695 case PING:
1696 if (NetPingIP == 0) {
1697 puts ("*** ERROR: ping address not given\n");
1698 return (1);
1699 }
1700 goto common;
1701 #endif
1702 #if defined(CONFIG_CMD_SNTP)
1703 case SNTP:
1704 if (NetNtpServerIP == 0) {
1705 puts ("*** ERROR: NTP server address not given\n");
1706 return (1);
1707 }
1708 goto common;
1709 #endif
1710 #if defined(CONFIG_CMD_DNS)
1711 case DNS:
1712 if (NetOurDNSIP == 0) {
1713 puts("*** ERROR: DNS server address not given\n");
1714 return 1;
1715 }
1716 goto common;
1717 #endif
1718 #if defined(CONFIG_CMD_NFS)
1719 case NFS:
1720 #endif
1721 case NETCONS:
1722 case TFTP:
1723 if (NetServerIP == 0) {
1724 puts ("*** ERROR: `serverip' not set\n");
1725 return (1);
1726 }
1727 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1728 common:
1729 #endif
1730
1731 if (NetOurIP == 0) {
1732 puts ("*** ERROR: `ipaddr' not set\n");
1733 return (1);
1734 }
1735 /* Fall through */
1736
1737 #ifdef CONFIG_CMD_RARP
1738 case RARP:
1739 #endif
1740 case BOOTP:
1741 case CDP:
1742 case DHCP:
1743 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1744 #ifdef CONFIG_NET_MULTI
1745 extern int eth_get_dev_index (void);
1746 int num = eth_get_dev_index ();
1747
1748 switch (num) {
1749 case -1:
1750 puts ("*** ERROR: No ethernet found.\n");
1751 return (1);
1752 case 0:
1753 puts ("*** ERROR: `ethaddr' not set\n");
1754 break;
1755 default:
1756 printf ("*** ERROR: `eth%daddr' not set\n",
1757 num);
1758 break;
1759 }
1760
1761 NetStartAgain ();
1762 return (2);
1763 #else
1764 puts ("*** ERROR: `ethaddr' not set\n");
1765 return (1);
1766 #endif
1767 }
1768 /* Fall through */
1769 default:
1770 return (0);
1771 }
1772 return (0); /* OK */
1773 }
1774 /**********************************************************************/
1775
1776 int
1777 NetCksumOk(uchar * ptr, int len)
1778 {
1779 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1780 }
1781
1782
1783 unsigned
1784 NetCksum(uchar * ptr, int len)
1785 {
1786 ulong xsum;
1787 ushort *p = (ushort *)ptr;
1788
1789 xsum = 0;
1790 while (len-- > 0)
1791 xsum += *p++;
1792 xsum = (xsum & 0xffff) + (xsum >> 16);
1793 xsum = (xsum & 0xffff) + (xsum >> 16);
1794 return (xsum & 0xffff);
1795 }
1796
1797 int
1798 NetEthHdrSize(void)
1799 {
1800 ushort myvlanid;
1801
1802 myvlanid = ntohs(NetOurVLAN);
1803 if (myvlanid == (ushort)-1)
1804 myvlanid = VLAN_NONE;
1805
1806 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1807 }
1808
1809 int
1810 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1811 {
1812 Ethernet_t *et = (Ethernet_t *)xet;
1813 ushort myvlanid;
1814
1815 myvlanid = ntohs(NetOurVLAN);
1816 if (myvlanid == (ushort)-1)
1817 myvlanid = VLAN_NONE;
1818
1819 memcpy (et->et_dest, addr, 6);
1820 memcpy (et->et_src, NetOurEther, 6);
1821 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1822 et->et_protlen = htons(prot);
1823 return ETHER_HDR_SIZE;
1824 } else {
1825 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1826
1827 vet->vet_vlan_type = htons(PROT_VLAN);
1828 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1829 vet->vet_type = htons(prot);
1830 return VLAN_ETHER_HDR_SIZE;
1831 }
1832 }
1833
1834 void
1835 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1836 {
1837 IP_t *ip = (IP_t *)xip;
1838
1839 /*
1840 * If the data is an odd number of bytes, zero the
1841 * byte after the last byte so that the checksum
1842 * will work.
1843 */
1844 if (len & 1)
1845 xip[IP_HDR_SIZE + len] = 0;
1846
1847 /*
1848 * Construct an IP and UDP header.
1849 * (need to set no fragment bit - XXX)
1850 */
1851 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */
1852 ip->ip_tos = 0;
1853 ip->ip_len = htons(IP_HDR_SIZE + len);
1854 ip->ip_id = htons(NetIPID++);
1855 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1856 ip->ip_ttl = 255;
1857 ip->ip_p = 17; /* UDP */
1858 ip->ip_sum = 0;
1859 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1860 NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */
1861 ip->udp_src = htons(sport);
1862 ip->udp_dst = htons(dport);
1863 ip->udp_len = htons(8 + len);
1864 ip->udp_xsum = 0;
1865 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1866 }
1867
1868 void copy_filename (char *dst, const char *src, int size)
1869 {
1870 if (*src && (*src == '"')) {
1871 ++src;
1872 --size;
1873 }
1874
1875 while ((--size > 0) && *src && (*src != '"')) {
1876 *dst++ = *src++;
1877 }
1878 *dst = '\0';
1879 }
1880
1881 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1882 /*
1883 * make port a little random (1024-17407)
1884 * This keeps the math somewhat trivial to compute, and seems to work with
1885 * all supported protocols/clients/servers
1886 */
1887 unsigned int random_port(void)
1888 {
1889 return 1024 + (get_timer(0) % 0x4000);
1890 }
1891 #endif
1892
1893 void ip_to_string (IPaddr_t x, char *s)
1894 {
1895 x = ntohl (x);
1896 sprintf (s, "%d.%d.%d.%d",
1897 (int) ((x >> 24) & 0xff),
1898 (int) ((x >> 16) & 0xff),
1899 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1900 );
1901 }
1902
1903 void VLAN_to_string(ushort x, char *s)
1904 {
1905 x = ntohs(x);
1906
1907 if (x == (ushort)-1)
1908 x = VLAN_NONE;
1909
1910 if (x == VLAN_NONE)
1911 strcpy(s, "none");
1912 else
1913 sprintf(s, "%d", x & VLAN_IDMASK);
1914 }
1915
1916 ushort string_to_VLAN(const char *s)
1917 {
1918 ushort id;
1919
1920 if (s == NULL)
1921 return htons(VLAN_NONE);
1922
1923 if (*s < '0' || *s > '9')
1924 id = VLAN_NONE;
1925 else
1926 id = (ushort)simple_strtoul(s, NULL, 10);
1927
1928 return htons(id);
1929 }
1930
1931 ushort getenv_VLAN(char *var)
1932 {
1933 return (string_to_VLAN(getenv(var)));
1934 }
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