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Merge branch 'master' of git://git.denx.de/u-boot-nios
[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 /* Milliseconds before trying ARP again */
105 # define ARP_TIMEOUT 5000UL
106 #else
107 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
108 #endif
109
110
111 #ifndef CONFIG_NET_RETRY_COUNT
112 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
113 #else
114 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
115 #endif
116
117 /** BOOTP EXTENTIONS **/
118
119 /* Our subnet mask (0=unknown) */
120 IPaddr_t NetOurSubnetMask;
121 /* Our gateways IP address */
122 IPaddr_t NetOurGatewayIP;
123 /* Our DNS IP address */
124 IPaddr_t NetOurDNSIP;
125 #if defined(CONFIG_BOOTP_DNS2)
126 /* Our 2nd DNS IP address */
127 IPaddr_t NetOurDNS2IP;
128 #endif
129 /* Our NIS domain */
130 char NetOurNISDomain[32] = {0,};
131 /* Our hostname */
132 char NetOurHostName[32] = {0,};
133 /* Our bootpath */
134 char NetOurRootPath[64] = {0,};
135 /* Our bootfile size in blocks */
136 ushort NetBootFileSize;
137
138 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
139 IPaddr_t Mcast_addr;
140 #endif
141
142 /** END OF BOOTP EXTENTIONS **/
143
144 /* The actual transferred size of the bootfile (in bytes) */
145 ulong NetBootFileXferSize;
146 /* Our ethernet address */
147 uchar NetOurEther[6];
148 /* Boot server enet address */
149 uchar NetServerEther[6];
150 /* Our IP addr (0 = unknown) */
151 IPaddr_t NetOurIP;
152 /* Server IP addr (0 = unknown) */
153 IPaddr_t NetServerIP;
154 /* Current receive packet */
155 volatile uchar *NetRxPacket;
156 /* Current rx packet length */
157 int NetRxPacketLen;
158 /* IP packet ID */
159 unsigned NetIPID;
160 /* Ethernet bcast address */
161 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
162 uchar NetEtherNullAddr[6];
163 #ifdef CONFIG_API
164 void (*push_packet)(volatile void *, int len) = 0;
165 #endif
166 #if defined(CONFIG_CMD_CDP)
167 /* Ethernet bcast address */
168 uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
169 #endif
170 /* Network loop state */
171 int NetState;
172 /* Tried all network devices */
173 int NetRestartWrap;
174 /* Network loop restarted */
175 static int NetRestarted;
176 /* At least one device configured */
177 static int NetDevExists;
178
179 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
180 /* default is without VLAN */
181 ushort NetOurVLAN = 0xFFFF;
182 /* ditto */
183 ushort NetOurNativeVLAN = 0xFFFF;
184
185 /* Boot File name */
186 char BootFile[128];
187
188 #if defined(CONFIG_CMD_PING)
189 /* the ip address to ping */
190 IPaddr_t NetPingIP;
191
192 static void PingStart(void);
193 #endif
194
195 #if defined(CONFIG_CMD_CDP)
196 static void CDPStart(void);
197 #endif
198
199 #if defined(CONFIG_CMD_SNTP)
200 /* NTP server IP address */
201 IPaddr_t NetNtpServerIP;
202 /* offset time from UTC */
203 int NetTimeOffset;
204 #endif
205
206 #ifdef CONFIG_NETCONSOLE
207 void NcStart(void);
208 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
209 #endif
210
211 volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
212
213 /* Receive packet */
214 volatile uchar *NetRxPackets[PKTBUFSRX];
215
216 /* Current RX packet handler */
217 static rxhand_f *packetHandler;
218 #ifdef CONFIG_CMD_TFTPPUT
219 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */
220 #endif
221 /* Current timeout handler */
222 static thand_f *timeHandler;
223 /* Time base value */
224 static ulong timeStart;
225 /* Current timeout value */
226 static ulong timeDelta;
227 /* THE transmit packet */
228 volatile uchar *NetTxPacket;
229
230 static int net_check_prereq(enum proto_t protocol);
231
232 static int NetTryCount;
233
234 /**********************************************************************/
235
236 IPaddr_t NetArpWaitPacketIP;
237 IPaddr_t NetArpWaitReplyIP;
238 /* MAC address of waiting packet's destination */
239 uchar *NetArpWaitPacketMAC;
240 /* THE transmit packet */
241 uchar *NetArpWaitTxPacket;
242 int NetArpWaitTxPacketSize;
243 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
244 ulong NetArpWaitTimerStart;
245 int NetArpWaitTry;
246
247 void ArpRequest(void)
248 {
249 volatile uchar *pkt;
250 ARP_t *arp;
251
252 debug("ARP broadcast %d\n", NetArpWaitTry);
253
254 pkt = NetTxPacket;
255
256 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
257
258 arp = (ARP_t *) pkt;
259
260 arp->ar_hrd = htons(ARP_ETHER);
261 arp->ar_pro = htons(PROT_IP);
262 arp->ar_hln = 6;
263 arp->ar_pln = 4;
264 arp->ar_op = htons(ARPOP_REQUEST);
265
266 /* source ET addr */
267 memcpy(&arp->ar_data[0], NetOurEther, 6);
268 /* source IP addr */
269 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
270 /* dest ET addr = 0 */
271 memset(&arp->ar_data[10], '\0', 6);
272 if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
273 (NetOurIP & NetOurSubnetMask)) {
274 if (NetOurGatewayIP == 0) {
275 puts("## Warning: gatewayip needed but not set\n");
276 NetArpWaitReplyIP = NetArpWaitPacketIP;
277 } else {
278 NetArpWaitReplyIP = NetOurGatewayIP;
279 }
280 } else {
281 NetArpWaitReplyIP = NetArpWaitPacketIP;
282 }
283
284 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
285 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
286 }
287
288 void ArpTimeoutCheck(void)
289 {
290 ulong t;
291
292 if (!NetArpWaitPacketIP)
293 return;
294
295 t = get_timer(0);
296
297 /* check for arp timeout */
298 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
299 NetArpWaitTry++;
300
301 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
302 puts("\nARP Retry count exceeded; starting again\n");
303 NetArpWaitTry = 0;
304 NetStartAgain();
305 } else {
306 NetArpWaitTimerStart = t;
307 ArpRequest();
308 }
309 }
310 }
311
312 /*
313 * Check if autoload is enabled. If so, use either NFS or TFTP to download
314 * the boot file.
315 */
316 void net_auto_load(void)
317 {
318 const char *s = getenv("autoload");
319
320 if (s != NULL) {
321 if (*s == 'n') {
322 /*
323 * Just use BOOTP/RARP to configure system;
324 * Do not use TFTP to load the bootfile.
325 */
326 NetState = NETLOOP_SUCCESS;
327 return;
328 }
329 #if defined(CONFIG_CMD_NFS)
330 if (strcmp(s, "NFS") == 0) {
331 /*
332 * Use NFS to load the bootfile.
333 */
334 NfsStart();
335 return;
336 }
337 #endif
338 }
339 TftpStart(TFTPGET);
340 }
341
342 static void NetInitLoop(enum proto_t protocol)
343 {
344 static int env_changed_id;
345 bd_t *bd = gd->bd;
346 int env_id = get_env_id();
347
348 /* update only when the environment has changed */
349 if (env_changed_id != env_id) {
350 NetOurIP = getenv_IPaddr("ipaddr");
351 NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
352 NetOurGatewayIP = getenv_IPaddr("gatewayip");
353 NetOurSubnetMask = getenv_IPaddr("netmask");
354 NetServerIP = getenv_IPaddr("serverip");
355 NetOurNativeVLAN = getenv_VLAN("nvlan");
356 NetOurVLAN = getenv_VLAN("vlan");
357 #if defined(CONFIG_CMD_DNS)
358 NetOurDNSIP = getenv_IPaddr("dnsip");
359 #endif
360 env_changed_id = env_id;
361 }
362
363 return;
364 }
365
366 /**********************************************************************/
367 /*
368 * Main network processing loop.
369 */
370
371 int NetLoop(enum proto_t protocol)
372 {
373 bd_t *bd = gd->bd;
374 int ret = -1;
375
376 NetRestarted = 0;
377 NetDevExists = 0;
378
379 /* XXX problem with bss workaround */
380 NetArpWaitPacketMAC = NULL;
381 NetArpWaitTxPacket = NULL;
382 NetArpWaitPacketIP = 0;
383 NetArpWaitReplyIP = 0;
384 NetArpWaitTxPacket = NULL;
385 NetTxPacket = NULL;
386 NetTryCount = 1;
387
388 if (!NetTxPacket) {
389 int i;
390 /*
391 * Setup packet buffers, aligned correctly.
392 */
393 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
394 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
395 for (i = 0; i < PKTBUFSRX; i++)
396 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
397 }
398
399 if (!NetArpWaitTxPacket) {
400 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
401 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
402 NetArpWaitTxPacketSize = 0;
403 }
404
405 eth_halt();
406 eth_set_current();
407 if (eth_init(bd) < 0) {
408 eth_halt();
409 return -1;
410 }
411
412 restart:
413 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
414
415 NetState = NETLOOP_CONTINUE;
416
417 /*
418 * Start the ball rolling with the given start function. From
419 * here on, this code is a state machine driven by received
420 * packets and timer events.
421 */
422 NetInitLoop(protocol);
423
424 switch (net_check_prereq(protocol)) {
425 case 1:
426 /* network not configured */
427 eth_halt();
428 return -1;
429
430 case 2:
431 /* network device not configured */
432 break;
433
434 case 0:
435 NetDevExists = 1;
436 NetBootFileXferSize = 0;
437 switch (protocol) {
438 case TFTPGET:
439 #ifdef CONFIG_CMD_TFTPPUT
440 case TFTPPUT:
441 #endif
442 /* always use ARP to get server ethernet address */
443 TftpStart(protocol);
444 break;
445 #ifdef CONFIG_CMD_TFTPSRV
446 case TFTPSRV:
447 TftpStartServer();
448 break;
449 #endif
450 #if defined(CONFIG_CMD_DHCP)
451 case DHCP:
452 BootpTry = 0;
453 NetOurIP = 0;
454 DhcpRequest(); /* Basically same as BOOTP */
455 break;
456 #endif
457
458 case BOOTP:
459 BootpTry = 0;
460 NetOurIP = 0;
461 BootpRequest();
462 break;
463
464 #if defined(CONFIG_CMD_RARP)
465 case RARP:
466 RarpTry = 0;
467 NetOurIP = 0;
468 RarpRequest();
469 break;
470 #endif
471 #if defined(CONFIG_CMD_PING)
472 case PING:
473 PingStart();
474 break;
475 #endif
476 #if defined(CONFIG_CMD_NFS)
477 case NFS:
478 NfsStart();
479 break;
480 #endif
481 #if defined(CONFIG_CMD_CDP)
482 case CDP:
483 CDPStart();
484 break;
485 #endif
486 #ifdef CONFIG_NETCONSOLE
487 case NETCONS:
488 NcStart();
489 break;
490 #endif
491 #if defined(CONFIG_CMD_SNTP)
492 case SNTP:
493 SntpStart();
494 break;
495 #endif
496 #if defined(CONFIG_CMD_DNS)
497 case DNS:
498 DnsStart();
499 break;
500 #endif
501 default:
502 break;
503 }
504
505 break;
506 }
507
508 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
509 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
510 defined(CONFIG_STATUS_LED) && \
511 defined(STATUS_LED_RED)
512 /*
513 * Echo the inverted link state to the fault LED.
514 */
515 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
516 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
517 else
518 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
519 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
520 #endif /* CONFIG_MII, ... */
521
522 /*
523 * Main packet reception loop. Loop receiving packets until
524 * someone sets `NetState' to a state that terminates.
525 */
526 for (;;) {
527 WATCHDOG_RESET();
528 #ifdef CONFIG_SHOW_ACTIVITY
529 {
530 extern void show_activity(int arg);
531 show_activity(1);
532 }
533 #endif
534 /*
535 * Check the ethernet for a new packet. The ethernet
536 * receive routine will process it.
537 */
538 eth_rx();
539
540 /*
541 * Abort if ctrl-c was pressed.
542 */
543 if (ctrlc()) {
544 eth_halt();
545 puts("\nAbort\n");
546 goto done;
547 }
548
549 ArpTimeoutCheck();
550
551 /*
552 * Check for a timeout, and run the timeout handler
553 * if we have one.
554 */
555 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
556 thand_f *x;
557
558 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
559 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
560 defined(CONFIG_STATUS_LED) && \
561 defined(STATUS_LED_RED)
562 /*
563 * Echo the inverted link state to the fault LED.
564 */
565 if (miiphy_link(eth_get_dev()->name,
566 CONFIG_SYS_FAULT_MII_ADDR)) {
567 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
568 } else {
569 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
570 }
571 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
572 #endif /* CONFIG_MII, ... */
573 x = timeHandler;
574 timeHandler = (thand_f *)0;
575 (*x)();
576 }
577
578
579 switch (NetState) {
580
581 case NETLOOP_RESTART:
582 NetRestarted = 1;
583 goto restart;
584
585 case NETLOOP_SUCCESS:
586 if (NetBootFileXferSize > 0) {
587 char buf[20];
588 printf("Bytes transferred = %ld (%lx hex)\n",
589 NetBootFileXferSize,
590 NetBootFileXferSize);
591 sprintf(buf, "%lX", NetBootFileXferSize);
592 setenv("filesize", buf);
593
594 sprintf(buf, "%lX", (unsigned long)load_addr);
595 setenv("fileaddr", buf);
596 }
597 eth_halt();
598 ret = NetBootFileXferSize;
599 goto done;
600
601 case NETLOOP_FAIL:
602 goto done;
603 }
604 }
605
606 done:
607 #ifdef CONFIG_CMD_TFTPPUT
608 /* Clear out the handlers */
609 NetSetHandler(NULL);
610 net_set_icmp_handler(NULL);
611 #endif
612 return ret;
613 }
614
615 /**********************************************************************/
616
617 static void
618 startAgainTimeout(void)
619 {
620 NetState = NETLOOP_RESTART;
621 }
622
623 static void
624 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
625 unsigned src, unsigned len)
626 {
627 /* Totally ignore the packet */
628 }
629
630 void NetStartAgain(void)
631 {
632 char *nretry;
633 int retry_forever = 0;
634 unsigned long retrycnt = 0;
635
636 nretry = getenv("netretry");
637 if (nretry) {
638 if (!strcmp(nretry, "yes"))
639 retry_forever = 1;
640 else if (!strcmp(nretry, "no"))
641 retrycnt = 0;
642 else if (!strcmp(nretry, "once"))
643 retrycnt = 1;
644 else
645 retrycnt = simple_strtoul(nretry, NULL, 0);
646 } else
647 retry_forever = 1;
648
649 if ((!retry_forever) && (NetTryCount >= retrycnt)) {
650 eth_halt();
651 NetState = NETLOOP_FAIL;
652 return;
653 }
654
655 NetTryCount++;
656
657 eth_halt();
658 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
659 eth_try_another(!NetRestarted);
660 #endif
661 eth_init(gd->bd);
662 if (NetRestartWrap) {
663 NetRestartWrap = 0;
664 if (NetDevExists) {
665 NetSetTimeout(10000UL, startAgainTimeout);
666 NetSetHandler(startAgainHandler);
667 } else {
668 NetState = NETLOOP_FAIL;
669 }
670 } else {
671 NetState = NETLOOP_RESTART;
672 }
673 }
674
675 /**********************************************************************/
676 /*
677 * Miscelaneous bits.
678 */
679
680 void
681 NetSetHandler(rxhand_f *f)
682 {
683 packetHandler = f;
684 }
685
686 #ifdef CONFIG_CMD_TFTPPUT
687 void net_set_icmp_handler(rxhand_icmp_f *f)
688 {
689 packet_icmp_handler = f;
690 }
691 #endif
692
693 void
694 NetSetTimeout(ulong iv, thand_f *f)
695 {
696 if (iv == 0) {
697 timeHandler = (thand_f *)0;
698 } else {
699 timeHandler = f;
700 timeStart = get_timer(0);
701 timeDelta = iv;
702 }
703 }
704
705
706 void
707 NetSendPacket(volatile uchar *pkt, int len)
708 {
709 (void) eth_send(pkt, len);
710 }
711
712 int
713 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
714 {
715 uchar *pkt;
716
717 /* convert to new style broadcast */
718 if (dest == 0)
719 dest = 0xFFFFFFFF;
720
721 /* if broadcast, make the ether address a broadcast and don't do ARP */
722 if (dest == 0xFFFFFFFF)
723 ether = NetBcastAddr;
724
725 /*
726 * if MAC address was not discovered yet, save the packet and do
727 * an ARP request
728 */
729 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
730
731 debug("sending ARP for %08lx\n", dest);
732
733 NetArpWaitPacketIP = dest;
734 NetArpWaitPacketMAC = ether;
735
736 pkt = NetArpWaitTxPacket;
737 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
738
739 NetSetIP(pkt, dest, dport, sport, len);
740 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
741 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
742
743 /* size of the waiting packet */
744 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
745 IP_HDR_SIZE + len;
746
747 /* and do the ARP request */
748 NetArpWaitTry = 1;
749 NetArpWaitTimerStart = get_timer(0);
750 ArpRequest();
751 return 1; /* waiting */
752 }
753
754 debug("sending UDP to %08lx/%pM\n", dest, ether);
755
756 pkt = (uchar *)NetTxPacket;
757 pkt += NetSetEther(pkt, ether, PROT_IP);
758 NetSetIP(pkt, dest, dport, sport, len);
759 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
760
761 return 0; /* transmitted */
762 }
763
764 #if defined(CONFIG_CMD_PING)
765 static ushort PingSeqNo;
766
767 int PingSend(void)
768 {
769 static uchar mac[6];
770 volatile IP_t *ip;
771 volatile ushort *s;
772 uchar *pkt;
773
774 /* XXX always send arp request */
775
776 memcpy(mac, NetEtherNullAddr, 6);
777
778 debug("sending ARP for %08lx\n", NetPingIP);
779
780 NetArpWaitPacketIP = NetPingIP;
781 NetArpWaitPacketMAC = mac;
782
783 pkt = NetArpWaitTxPacket;
784 pkt += NetSetEther(pkt, mac, PROT_IP);
785
786 ip = (volatile IP_t *)pkt;
787
788 /*
789 * Construct an IP and ICMP header.
790 * (need to set no fragment bit - XXX)
791 */
792 /* IP_HDR_SIZE / 4 (not including UDP) */
793 ip->ip_hl_v = 0x45;
794 ip->ip_tos = 0;
795 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8);
796 ip->ip_id = htons(NetIPID++);
797 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
798 ip->ip_ttl = 255;
799 ip->ip_p = 0x01; /* ICMP */
800 ip->ip_sum = 0;
801 /* already in network byte order */
802 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
803 /* - "" - */
804 NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
805 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
806
807 s = &ip->udp_src; /* XXX ICMP starts here */
808 s[0] = htons(0x0800); /* echo-request, code */
809 s[1] = 0; /* checksum */
810 s[2] = 0; /* identifier */
811 s[3] = htons(PingSeqNo++); /* sequence number */
812 s[1] = ~NetCksum((uchar *)s, 8/2);
813
814 /* size of the waiting packet */
815 NetArpWaitTxPacketSize =
816 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
817
818 /* and do the ARP request */
819 NetArpWaitTry = 1;
820 NetArpWaitTimerStart = get_timer(0);
821 ArpRequest();
822 return 1; /* waiting */
823 }
824
825 static void
826 PingTimeout(void)
827 {
828 eth_halt();
829 NetState = NETLOOP_FAIL; /* we did not get the reply */
830 }
831
832 static void
833 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
834 unsigned len)
835 {
836 if (sip != NetPingIP)
837 return;
838
839 NetState = NETLOOP_SUCCESS;
840 }
841
842 static void PingStart(void)
843 {
844 printf("Using %s device\n", eth_get_name());
845 NetSetTimeout(10000UL, PingTimeout);
846 NetSetHandler(PingHandler);
847
848 PingSend();
849 }
850 #endif
851
852 #if defined(CONFIG_CMD_CDP)
853
854 #define CDP_DEVICE_ID_TLV 0x0001
855 #define CDP_ADDRESS_TLV 0x0002
856 #define CDP_PORT_ID_TLV 0x0003
857 #define CDP_CAPABILITIES_TLV 0x0004
858 #define CDP_VERSION_TLV 0x0005
859 #define CDP_PLATFORM_TLV 0x0006
860 #define CDP_NATIVE_VLAN_TLV 0x000a
861 #define CDP_APPLIANCE_VLAN_TLV 0x000e
862 #define CDP_TRIGGER_TLV 0x000f
863 #define CDP_POWER_CONSUMPTION_TLV 0x0010
864 #define CDP_SYSNAME_TLV 0x0014
865 #define CDP_SYSOBJECT_TLV 0x0015
866 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016
867
868 #define CDP_TIMEOUT 250UL /* one packet every 250ms */
869
870 static int CDPSeq;
871 static int CDPOK;
872
873 ushort CDPNativeVLAN;
874 ushort CDPApplianceVLAN;
875
876 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
877 0x00 };
878
879 static ushort CDP_compute_csum(const uchar *buff, ushort len)
880 {
881 ushort csum;
882 int odd;
883 ulong result = 0;
884 ushort leftover;
885 ushort *p;
886
887 if (len > 0) {
888 odd = 1 & (ulong)buff;
889 if (odd) {
890 result = *buff << 8;
891 len--;
892 buff++;
893 }
894 while (len > 1) {
895 p = (ushort *)buff;
896 result += *p++;
897 buff = (uchar *)p;
898 if (result & 0x80000000)
899 result = (result & 0xFFFF) + (result >> 16);
900 len -= 2;
901 }
902 if (len) {
903 leftover = (signed short)(*(const signed char *)buff);
904 /* CISCO SUCKS big time! (and blows too):
905 * CDP uses the IP checksum algorithm with a twist;
906 * for the last byte it *sign* extends and sums.
907 */
908 result = (result & 0xffff0000) |
909 ((result + leftover) & 0x0000ffff);
910 }
911 while (result >> 16)
912 result = (result & 0xFFFF) + (result >> 16);
913
914 if (odd)
915 result = ((result >> 8) & 0xff) |
916 ((result & 0xff) << 8);
917 }
918
919 /* add up 16-bit and 17-bit words for 17+c bits */
920 result = (result & 0xffff) + (result >> 16);
921 /* add up 16-bit and 2-bit for 16+c bit */
922 result = (result & 0xffff) + (result >> 16);
923 /* add up carry.. */
924 result = (result & 0xffff) + (result >> 16);
925
926 /* negate */
927 csum = ~(ushort)result;
928
929 /* run time endian detection */
930 if (csum != htons(csum)) /* little endian */
931 csum = htons(csum);
932
933 return csum;
934 }
935
936 int CDPSendTrigger(void)
937 {
938 volatile uchar *pkt;
939 volatile ushort *s;
940 volatile ushort *cp;
941 Ethernet_t *et;
942 int len;
943 ushort chksum;
944 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \
945 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM)
946 char buf[32];
947 #endif
948
949 pkt = NetTxPacket;
950 et = (Ethernet_t *)pkt;
951
952 /* NOTE: trigger sent not on any VLAN */
953
954 /* form ethernet header */
955 memcpy(et->et_dest, NetCDPAddr, 6);
956 memcpy(et->et_src, NetOurEther, 6);
957
958 pkt += ETHER_HDR_SIZE;
959
960 /* SNAP header */
961 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
962 pkt += sizeof(CDP_SNAP_hdr);
963
964 /* CDP header */
965 *pkt++ = 0x02; /* CDP version 2 */
966 *pkt++ = 180; /* TTL */
967 s = (volatile ushort *)pkt;
968 cp = s;
969 /* checksum (0 for later calculation) */
970 *s++ = htons(0);
971
972 /* CDP fields */
973 #ifdef CONFIG_CDP_DEVICE_ID
974 *s++ = htons(CDP_DEVICE_ID_TLV);
975 *s++ = htons(CONFIG_CDP_DEVICE_ID);
976 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
977 memcpy((uchar *)s, buf, 16);
978 s += 16 / 2;
979 #endif
980
981 #ifdef CONFIG_CDP_PORT_ID
982 *s++ = htons(CDP_PORT_ID_TLV);
983 memset(buf, 0, sizeof(buf));
984 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
985 len = strlen(buf);
986 if (len & 1) /* make it even */
987 len++;
988 *s++ = htons(len + 4);
989 memcpy((uchar *)s, buf, len);
990 s += len / 2;
991 #endif
992
993 #ifdef CONFIG_CDP_CAPABILITIES
994 *s++ = htons(CDP_CAPABILITIES_TLV);
995 *s++ = htons(8);
996 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
997 s += 2;
998 #endif
999
1000 #ifdef CONFIG_CDP_VERSION
1001 *s++ = htons(CDP_VERSION_TLV);
1002 memset(buf, 0, sizeof(buf));
1003 strcpy(buf, CONFIG_CDP_VERSION);
1004 len = strlen(buf);
1005 if (len & 1) /* make it even */
1006 len++;
1007 *s++ = htons(len + 4);
1008 memcpy((uchar *)s, buf, len);
1009 s += len / 2;
1010 #endif
1011
1012 #ifdef CONFIG_CDP_PLATFORM
1013 *s++ = htons(CDP_PLATFORM_TLV);
1014 memset(buf, 0, sizeof(buf));
1015 strcpy(buf, CONFIG_CDP_PLATFORM);
1016 len = strlen(buf);
1017 if (len & 1) /* make it even */
1018 len++;
1019 *s++ = htons(len + 4);
1020 memcpy((uchar *)s, buf, len);
1021 s += len / 2;
1022 #endif
1023
1024 #ifdef CONFIG_CDP_TRIGGER
1025 *s++ = htons(CDP_TRIGGER_TLV);
1026 *s++ = htons(8);
1027 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1028 s += 2;
1029 #endif
1030
1031 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1032 *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1033 *s++ = htons(6);
1034 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1035 #endif
1036
1037 /* length of ethernet packet */
1038 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1039 et->et_protlen = htons(len);
1040
1041 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1042 chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1043 (uchar *)s - (NetTxPacket + len));
1044 if (chksum == 0)
1045 chksum = 0xFFFF;
1046 *cp = htons(chksum);
1047
1048 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1049 return 0;
1050 }
1051
1052 static void
1053 CDPTimeout(void)
1054 {
1055 CDPSeq++;
1056
1057 if (CDPSeq < 3) {
1058 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1059 CDPSendTrigger();
1060 return;
1061 }
1062
1063 /* if not OK try again */
1064 if (!CDPOK)
1065 NetStartAgain();
1066 else
1067 NetState = NETLOOP_SUCCESS;
1068 }
1069
1070 static void
1071 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1072 unsigned len)
1073 {
1074 /* nothing */
1075 }
1076
1077 static void
1078 CDPHandler(const uchar *pkt, unsigned len)
1079 {
1080 const uchar *t;
1081 const ushort *ss;
1082 ushort type, tlen;
1083 ushort vlan, nvlan;
1084
1085 /* minimum size? */
1086 if (len < sizeof(CDP_SNAP_hdr) + 4)
1087 goto pkt_short;
1088
1089 /* check for valid CDP SNAP header */
1090 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1091 return;
1092
1093 pkt += sizeof(CDP_SNAP_hdr);
1094 len -= sizeof(CDP_SNAP_hdr);
1095
1096 /* Version of CDP protocol must be >= 2 and TTL != 0 */
1097 if (pkt[0] < 0x02 || pkt[1] == 0)
1098 return;
1099
1100 /*
1101 * if version is greater than 0x02 maybe we'll have a problem;
1102 * output a warning
1103 */
1104 if (pkt[0] != 0x02)
1105 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1106 pkt[0] & 0xff);
1107
1108 if (CDP_compute_csum(pkt, len) != 0)
1109 return;
1110
1111 pkt += 4;
1112 len -= 4;
1113
1114 vlan = htons(-1);
1115 nvlan = htons(-1);
1116 while (len > 0) {
1117 if (len < 4)
1118 goto pkt_short;
1119
1120 ss = (const ushort *)pkt;
1121 type = ntohs(ss[0]);
1122 tlen = ntohs(ss[1]);
1123 if (tlen > len)
1124 goto pkt_short;
1125
1126 pkt += tlen;
1127 len -= tlen;
1128
1129 ss += 2; /* point ss to the data of the TLV */
1130 tlen -= 4;
1131
1132 switch (type) {
1133 case CDP_DEVICE_ID_TLV:
1134 break;
1135 case CDP_ADDRESS_TLV:
1136 break;
1137 case CDP_PORT_ID_TLV:
1138 break;
1139 case CDP_CAPABILITIES_TLV:
1140 break;
1141 case CDP_VERSION_TLV:
1142 break;
1143 case CDP_PLATFORM_TLV:
1144 break;
1145 case CDP_NATIVE_VLAN_TLV:
1146 nvlan = *ss;
1147 break;
1148 case CDP_APPLIANCE_VLAN_TLV:
1149 t = (const uchar *)ss;
1150 while (tlen > 0) {
1151 if (tlen < 3)
1152 goto pkt_short;
1153
1154 ss = (const ushort *)(t + 1);
1155
1156 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1157 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1158 vlan = *ss;
1159 #else
1160 /* XXX will this work; dunno */
1161 vlan = ntohs(*ss);
1162 #endif
1163 t += 3; tlen -= 3;
1164 }
1165 break;
1166 case CDP_TRIGGER_TLV:
1167 break;
1168 case CDP_POWER_CONSUMPTION_TLV:
1169 break;
1170 case CDP_SYSNAME_TLV:
1171 break;
1172 case CDP_SYSOBJECT_TLV:
1173 break;
1174 case CDP_MANAGEMENT_ADDRESS_TLV:
1175 break;
1176 }
1177 }
1178
1179 CDPApplianceVLAN = vlan;
1180 CDPNativeVLAN = nvlan;
1181
1182 CDPOK = 1;
1183 return;
1184
1185 pkt_short:
1186 printf("** CDP packet is too short\n");
1187 return;
1188 }
1189
1190 static void CDPStart(void)
1191 {
1192 printf("Using %s device\n", eth_get_name());
1193 CDPSeq = 0;
1194 CDPOK = 0;
1195
1196 CDPNativeVLAN = htons(-1);
1197 CDPApplianceVLAN = htons(-1);
1198
1199 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1200 NetSetHandler(CDPDummyHandler);
1201
1202 CDPSendTrigger();
1203 }
1204 #endif
1205
1206 #ifdef CONFIG_IP_DEFRAG
1207 /*
1208 * This function collects fragments in a single packet, according
1209 * to the algorithm in RFC815. It returns NULL or the pointer to
1210 * a complete packet, in static storage
1211 */
1212 #ifndef CONFIG_NET_MAXDEFRAG
1213 #define CONFIG_NET_MAXDEFRAG 16384
1214 #endif
1215 /*
1216 * MAXDEFRAG, above, is chosen in the config file and is real data
1217 * so we need to add the NFS overhead, which is more than TFTP.
1218 * To use sizeof in the internal unnamed structures, we need a real
1219 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1220 * The compiler doesn't complain nor allocates the actual structure
1221 */
1222 static struct rpc_t rpc_specimen;
1223 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1224
1225 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1226
1227 /*
1228 * this is the packet being assembled, either data or frag control.
1229 * Fragments go by 8 bytes, so this union must be 8 bytes long
1230 */
1231 struct hole {
1232 /* first_byte is address of this structure */
1233 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
1234 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
1235 u16 prev_hole; /* index of prev, 0 == none */
1236 u16 unused;
1237 };
1238
1239 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1240 {
1241 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1242 static u16 first_hole, total_len;
1243 struct hole *payload, *thisfrag, *h, *newh;
1244 IP_t *localip = (IP_t *)pkt_buff;
1245 uchar *indata = (uchar *)ip;
1246 int offset8, start, len, done = 0;
1247 u16 ip_off = ntohs(ip->ip_off);
1248
1249 /* payload starts after IP header, this fragment is in there */
1250 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1251 offset8 = (ip_off & IP_OFFS);
1252 thisfrag = payload + offset8;
1253 start = offset8 * 8;
1254 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1255
1256 if (start + len > IP_MAXUDP) /* fragment extends too far */
1257 return NULL;
1258
1259 if (!total_len || localip->ip_id != ip->ip_id) {
1260 /* new (or different) packet, reset structs */
1261 total_len = 0xffff;
1262 payload[0].last_byte = ~0;
1263 payload[0].next_hole = 0;
1264 payload[0].prev_hole = 0;
1265 first_hole = 0;
1266 /* any IP header will work, copy the first we received */
1267 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1268 }
1269
1270 /*
1271 * What follows is the reassembly algorithm. We use the payload
1272 * array as a linked list of hole descriptors, as each hole starts
1273 * at a multiple of 8 bytes. However, last byte can be whatever value,
1274 * so it is represented as byte count, not as 8-byte blocks.
1275 */
1276
1277 h = payload + first_hole;
1278 while (h->last_byte < start) {
1279 if (!h->next_hole) {
1280 /* no hole that far away */
1281 return NULL;
1282 }
1283 h = payload + h->next_hole;
1284 }
1285
1286 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1287 if (offset8 + ((len + 7) / 8) <= h - payload) {
1288 /* no overlap with holes (dup fragment?) */
1289 return NULL;
1290 }
1291
1292 if (!(ip_off & IP_FLAGS_MFRAG)) {
1293 /* no more fragmentss: truncate this (last) hole */
1294 total_len = start + len;
1295 h->last_byte = start + len;
1296 }
1297
1298 /*
1299 * There is some overlap: fix the hole list. This code doesn't
1300 * deal with a fragment that overlaps with two different holes
1301 * (thus being a superset of a previously-received fragment).
1302 */
1303
1304 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1305 /* complete overlap with hole: remove hole */
1306 if (!h->prev_hole && !h->next_hole) {
1307 /* last remaining hole */
1308 done = 1;
1309 } else if (!h->prev_hole) {
1310 /* first hole */
1311 first_hole = h->next_hole;
1312 payload[h->next_hole].prev_hole = 0;
1313 } else if (!h->next_hole) {
1314 /* last hole */
1315 payload[h->prev_hole].next_hole = 0;
1316 } else {
1317 /* in the middle of the list */
1318 payload[h->next_hole].prev_hole = h->prev_hole;
1319 payload[h->prev_hole].next_hole = h->next_hole;
1320 }
1321
1322 } else if (h->last_byte <= start + len) {
1323 /* overlaps with final part of the hole: shorten this hole */
1324 h->last_byte = start;
1325
1326 } else if (h >= thisfrag) {
1327 /* overlaps with initial part of the hole: move this hole */
1328 newh = thisfrag + (len / 8);
1329 *newh = *h;
1330 h = newh;
1331 if (h->next_hole)
1332 payload[h->next_hole].prev_hole = (h - payload);
1333 if (h->prev_hole)
1334 payload[h->prev_hole].next_hole = (h - payload);
1335 else
1336 first_hole = (h - payload);
1337
1338 } else {
1339 /* fragment sits in the middle: split the hole */
1340 newh = thisfrag + (len / 8);
1341 *newh = *h;
1342 h->last_byte = start;
1343 h->next_hole = (newh - payload);
1344 newh->prev_hole = (h - payload);
1345 if (newh->next_hole)
1346 payload[newh->next_hole].prev_hole = (newh - payload);
1347 }
1348
1349 /* finally copy this fragment and possibly return whole packet */
1350 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1351 if (!done)
1352 return NULL;
1353
1354 localip->ip_len = htons(total_len);
1355 *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1356 return localip;
1357 }
1358
1359 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1360 {
1361 u16 ip_off = ntohs(ip->ip_off);
1362 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1363 return ip; /* not a fragment */
1364 return __NetDefragment(ip, lenp);
1365 }
1366
1367 #else /* !CONFIG_IP_DEFRAG */
1368
1369 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1370 {
1371 u16 ip_off = ntohs(ip->ip_off);
1372 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1373 return ip; /* not a fragment */
1374 return NULL;
1375 }
1376 #endif
1377
1378 /**
1379 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1380 * drop others.
1381 *
1382 * @parma ip IP packet containing the ICMP
1383 */
1384 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
1385 {
1386 ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
1387
1388 switch (icmph->type) {
1389 case ICMP_REDIRECT:
1390 if (icmph->code != ICMP_REDIR_HOST)
1391 return;
1392 printf(" ICMP Host Redirect to %pI4 ",
1393 &icmph->un.gateway);
1394 break;
1395 #if defined(CONFIG_CMD_PING)
1396 case ICMP_ECHO_REPLY:
1397 /*
1398 * IP header OK. Pass the packet to the
1399 * current handler.
1400 */
1401 /*
1402 * XXX point to ip packet - should this use
1403 * packet_icmp_handler?
1404 */
1405 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1406 break;
1407 case ICMP_ECHO_REQUEST:
1408 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1409 ETHER_HDR_SIZE + len);
1410
1411 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1412 memcpy(&et->et_src[0], NetOurEther, 6);
1413
1414 ip->ip_sum = 0;
1415 ip->ip_off = 0;
1416 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1417 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1418 ip->ip_sum = ~NetCksum((uchar *)ip,
1419 IP_HDR_SIZE_NO_UDP >> 1);
1420
1421 icmph->type = ICMP_ECHO_REPLY;
1422 icmph->checksum = 0;
1423 icmph->checksum = ~NetCksum((uchar *)icmph,
1424 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1425 (void) eth_send((uchar *)et,
1426 ETHER_HDR_SIZE + len);
1427 break;
1428 #endif
1429 default:
1430 #ifdef CONFIG_CMD_TFTPPUT
1431 if (packet_icmp_handler)
1432 packet_icmp_handler(icmph->type, icmph->code,
1433 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
1434 icmph->un.data, ntohs(ip->udp_len));
1435 #endif
1436 break;
1437 }
1438 }
1439
1440 void
1441 NetReceive(volatile uchar *inpkt, int len)
1442 {
1443 Ethernet_t *et;
1444 IP_t *ip;
1445 ARP_t *arp;
1446 IPaddr_t tmp;
1447 IPaddr_t src_ip;
1448 int x;
1449 uchar *pkt;
1450 #if defined(CONFIG_CMD_CDP)
1451 int iscdp;
1452 #endif
1453 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1454
1455 debug("packet received\n");
1456
1457 NetRxPacket = inpkt;
1458 NetRxPacketLen = len;
1459 et = (Ethernet_t *)inpkt;
1460
1461 /* too small packet? */
1462 if (len < ETHER_HDR_SIZE)
1463 return;
1464
1465 #ifdef CONFIG_API
1466 if (push_packet) {
1467 (*push_packet)(inpkt, len);
1468 return;
1469 }
1470 #endif
1471
1472 #if defined(CONFIG_CMD_CDP)
1473 /* keep track if packet is CDP */
1474 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1475 #endif
1476
1477 myvlanid = ntohs(NetOurVLAN);
1478 if (myvlanid == (ushort)-1)
1479 myvlanid = VLAN_NONE;
1480 mynvlanid = ntohs(NetOurNativeVLAN);
1481 if (mynvlanid == (ushort)-1)
1482 mynvlanid = VLAN_NONE;
1483
1484 x = ntohs(et->et_protlen);
1485
1486 debug("packet received\n");
1487
1488 if (x < 1514) {
1489 /*
1490 * Got a 802 packet. Check the other protocol field.
1491 */
1492 x = ntohs(et->et_prot);
1493
1494 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1495 len -= E802_HDR_SIZE;
1496
1497 } else if (x != PROT_VLAN) { /* normal packet */
1498 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1499 len -= ETHER_HDR_SIZE;
1500
1501 } else { /* VLAN packet */
1502 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1503
1504 debug("VLAN packet received\n");
1505
1506 /* too small packet? */
1507 if (len < VLAN_ETHER_HDR_SIZE)
1508 return;
1509
1510 /* if no VLAN active */
1511 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1512 #if defined(CONFIG_CMD_CDP)
1513 && iscdp == 0
1514 #endif
1515 )
1516 return;
1517
1518 cti = ntohs(vet->vet_tag);
1519 vlanid = cti & VLAN_IDMASK;
1520 x = ntohs(vet->vet_type);
1521
1522 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1523 len -= VLAN_ETHER_HDR_SIZE;
1524 }
1525
1526 debug("Receive from protocol 0x%x\n", x);
1527
1528 #if defined(CONFIG_CMD_CDP)
1529 if (iscdp) {
1530 CDPHandler((uchar *)ip, len);
1531 return;
1532 }
1533 #endif
1534
1535 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1536 if (vlanid == VLAN_NONE)
1537 vlanid = (mynvlanid & VLAN_IDMASK);
1538 /* not matched? */
1539 if (vlanid != (myvlanid & VLAN_IDMASK))
1540 return;
1541 }
1542
1543 switch (x) {
1544
1545 case PROT_ARP:
1546 /*
1547 * We have to deal with two types of ARP packets:
1548 * - REQUEST packets will be answered by sending our
1549 * IP address - if we know it.
1550 * - REPLY packates are expected only after we asked
1551 * for the TFTP server's or the gateway's ethernet
1552 * address; so if we receive such a packet, we set
1553 * the server ethernet address
1554 */
1555 debug("Got ARP\n");
1556
1557 arp = (ARP_t *)ip;
1558 if (len < ARP_HDR_SIZE) {
1559 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1560 return;
1561 }
1562 if (ntohs(arp->ar_hrd) != ARP_ETHER)
1563 return;
1564 if (ntohs(arp->ar_pro) != PROT_IP)
1565 return;
1566 if (arp->ar_hln != 6)
1567 return;
1568 if (arp->ar_pln != 4)
1569 return;
1570
1571 if (NetOurIP == 0)
1572 return;
1573
1574 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1575 return;
1576
1577 switch (ntohs(arp->ar_op)) {
1578 case ARPOP_REQUEST:
1579 /* reply with our IP address */
1580 debug("Got ARP REQUEST, return our IP\n");
1581 pkt = (uchar *)et;
1582 pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1583 arp->ar_op = htons(ARPOP_REPLY);
1584 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1585 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1586 memcpy(&arp->ar_data[0], NetOurEther, 6);
1587 NetCopyIP(&arp->ar_data[6], &NetOurIP);
1588 (void) eth_send((uchar *)et,
1589 (pkt - (uchar *)et) + ARP_HDR_SIZE);
1590 return;
1591
1592 case ARPOP_REPLY: /* arp reply */
1593 /* are we waiting for a reply */
1594 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1595 break;
1596
1597 #ifdef CONFIG_KEEP_SERVERADDR
1598 if (NetServerIP == NetArpWaitPacketIP) {
1599 char buf[20];
1600 sprintf(buf, "%pM", arp->ar_data);
1601 setenv("serveraddr", buf);
1602 }
1603 #endif
1604
1605 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1606 arp->ar_data);
1607
1608 tmp = NetReadIP(&arp->ar_data[6]);
1609
1610 /* matched waiting packet's address */
1611 if (tmp == NetArpWaitReplyIP) {
1612 debug("Got it\n");
1613 /* save address for later use */
1614 memcpy(NetArpWaitPacketMAC,
1615 &arp->ar_data[0], 6);
1616
1617 #ifdef CONFIG_NETCONSOLE
1618 (*packetHandler)(0, 0, 0, 0, 0);
1619 #endif
1620 /* modify header, and transmit it */
1621 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1622 (void) eth_send(NetArpWaitTxPacket,
1623 NetArpWaitTxPacketSize);
1624
1625 /* no arp request pending now */
1626 NetArpWaitPacketIP = 0;
1627 NetArpWaitTxPacketSize = 0;
1628 NetArpWaitPacketMAC = NULL;
1629
1630 }
1631 return;
1632 default:
1633 debug("Unexpected ARP opcode 0x%x\n",
1634 ntohs(arp->ar_op));
1635 return;
1636 }
1637 break;
1638
1639 #ifdef CONFIG_CMD_RARP
1640 case PROT_RARP:
1641 debug("Got RARP\n");
1642 arp = (ARP_t *)ip;
1643 if (len < ARP_HDR_SIZE) {
1644 printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1645 return;
1646 }
1647
1648 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1649 (ntohs(arp->ar_hrd) != ARP_ETHER) ||
1650 (ntohs(arp->ar_pro) != PROT_IP) ||
1651 (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1652
1653 puts("invalid RARP header\n");
1654 } else {
1655 NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1656 if (NetServerIP == 0)
1657 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1658 memcpy(NetServerEther, &arp->ar_data[0], 6);
1659
1660 (*packetHandler)(0, 0, 0, 0, 0);
1661 }
1662 break;
1663 #endif
1664 case PROT_IP:
1665 debug("Got IP\n");
1666 /* Before we start poking the header, make sure it is there */
1667 if (len < IP_HDR_SIZE) {
1668 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1669 return;
1670 }
1671 /* Check the packet length */
1672 if (len < ntohs(ip->ip_len)) {
1673 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1674 return;
1675 }
1676 len = ntohs(ip->ip_len);
1677 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1678
1679 /* Can't deal with anything except IPv4 */
1680 if ((ip->ip_hl_v & 0xf0) != 0x40)
1681 return;
1682 /* Can't deal with IP options (headers != 20 bytes) */
1683 if ((ip->ip_hl_v & 0x0f) > 0x05)
1684 return;
1685 /* Check the Checksum of the header */
1686 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1687 puts("checksum bad\n");
1688 return;
1689 }
1690 /* If it is not for us, ignore it */
1691 tmp = NetReadIP(&ip->ip_dst);
1692 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1693 #ifdef CONFIG_MCAST_TFTP
1694 if (Mcast_addr != tmp)
1695 #endif
1696 return;
1697 }
1698 /* Read source IP address for later use */
1699 src_ip = NetReadIP(&ip->ip_src);
1700 /*
1701 * The function returns the unchanged packet if it's not
1702 * a fragment, and either the complete packet or NULL if
1703 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1704 */
1705 ip = NetDefragment(ip, &len);
1706 if (!ip)
1707 return;
1708 /*
1709 * watch for ICMP host redirects
1710 *
1711 * There is no real handler code (yet). We just watch
1712 * for ICMP host redirect messages. In case anybody
1713 * sees these messages: please contact me
1714 * (wd@denx.de), or - even better - send me the
1715 * necessary fixes :-)
1716 *
1717 * Note: in all cases where I have seen this so far
1718 * it was a problem with the router configuration,
1719 * for instance when a router was configured in the
1720 * BOOTP reply, but the TFTP server was on the same
1721 * subnet. So this is probably a warning that your
1722 * configuration might be wrong. But I'm not really
1723 * sure if there aren't any other situations.
1724 *
1725 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1726 * we send a tftp packet to a dead connection, or when
1727 * there is no server at the other end.
1728 */
1729 if (ip->ip_p == IPPROTO_ICMP) {
1730 receive_icmp(ip, len, src_ip, et);
1731 return;
1732 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1733 return;
1734 }
1735
1736 #ifdef CONFIG_UDP_CHECKSUM
1737 if (ip->udp_xsum != 0) {
1738 ulong xsum;
1739 ushort *sumptr;
1740 ushort sumlen;
1741
1742 xsum = ip->ip_p;
1743 xsum += (ntohs(ip->udp_len));
1744 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1745 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1746 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1747 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1748
1749 sumlen = ntohs(ip->udp_len);
1750 sumptr = (ushort *) &(ip->udp_src);
1751
1752 while (sumlen > 1) {
1753 ushort sumdata;
1754
1755 sumdata = *sumptr++;
1756 xsum += ntohs(sumdata);
1757 sumlen -= 2;
1758 }
1759 if (sumlen > 0) {
1760 ushort sumdata;
1761
1762 sumdata = *(unsigned char *) sumptr;
1763 sumdata = (sumdata << 8) & 0xff00;
1764 xsum += sumdata;
1765 }
1766 while ((xsum >> 16) != 0) {
1767 xsum = (xsum & 0x0000ffff) +
1768 ((xsum >> 16) & 0x0000ffff);
1769 }
1770 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1771 printf(" UDP wrong checksum %08lx %08x\n",
1772 xsum, ntohs(ip->udp_xsum));
1773 return;
1774 }
1775 }
1776 #endif
1777
1778
1779 #ifdef CONFIG_NETCONSOLE
1780 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1781 ntohs(ip->udp_dst),
1782 ntohs(ip->udp_src),
1783 ntohs(ip->udp_len) - 8);
1784 #endif
1785 /*
1786 * IP header OK. Pass the packet to the current handler.
1787 */
1788 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1789 ntohs(ip->udp_dst),
1790 src_ip,
1791 ntohs(ip->udp_src),
1792 ntohs(ip->udp_len) - 8);
1793 break;
1794 }
1795 }
1796
1797
1798 /**********************************************************************/
1799
1800 static int net_check_prereq(enum proto_t protocol)
1801 {
1802 switch (protocol) {
1803 /* Fall through */
1804 #if defined(CONFIG_CMD_PING)
1805 case PING:
1806 if (NetPingIP == 0) {
1807 puts("*** ERROR: ping address not given\n");
1808 return 1;
1809 }
1810 goto common;
1811 #endif
1812 #if defined(CONFIG_CMD_SNTP)
1813 case SNTP:
1814 if (NetNtpServerIP == 0) {
1815 puts("*** ERROR: NTP server address not given\n");
1816 return 1;
1817 }
1818 goto common;
1819 #endif
1820 #if defined(CONFIG_CMD_DNS)
1821 case DNS:
1822 if (NetOurDNSIP == 0) {
1823 puts("*** ERROR: DNS server address not given\n");
1824 return 1;
1825 }
1826 goto common;
1827 #endif
1828 #if defined(CONFIG_CMD_NFS)
1829 case NFS:
1830 #endif
1831 case TFTPGET:
1832 case TFTPPUT:
1833 if (NetServerIP == 0) {
1834 puts("*** ERROR: `serverip' not set\n");
1835 return 1;
1836 }
1837 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1838 defined(CONFIG_CMD_DNS)
1839 common:
1840 #endif
1841 /* Fall through */
1842
1843 case NETCONS:
1844 case TFTPSRV:
1845 if (NetOurIP == 0) {
1846 puts("*** ERROR: `ipaddr' not set\n");
1847 return 1;
1848 }
1849 /* Fall through */
1850
1851 #ifdef CONFIG_CMD_RARP
1852 case RARP:
1853 #endif
1854 case BOOTP:
1855 case CDP:
1856 case DHCP:
1857 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1858 extern int eth_get_dev_index(void);
1859 int num = eth_get_dev_index();
1860
1861 switch (num) {
1862 case -1:
1863 puts("*** ERROR: No ethernet found.\n");
1864 return 1;
1865 case 0:
1866 puts("*** ERROR: `ethaddr' not set\n");
1867 break;
1868 default:
1869 printf("*** ERROR: `eth%daddr' not set\n",
1870 num);
1871 break;
1872 }
1873
1874 NetStartAgain();
1875 return 2;
1876 }
1877 /* Fall through */
1878 default:
1879 return 0;
1880 }
1881 return 0; /* OK */
1882 }
1883 /**********************************************************************/
1884
1885 int
1886 NetCksumOk(uchar *ptr, int len)
1887 {
1888 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1889 }
1890
1891
1892 unsigned
1893 NetCksum(uchar *ptr, int len)
1894 {
1895 ulong xsum;
1896 ushort *p = (ushort *)ptr;
1897
1898 xsum = 0;
1899 while (len-- > 0)
1900 xsum += *p++;
1901 xsum = (xsum & 0xffff) + (xsum >> 16);
1902 xsum = (xsum & 0xffff) + (xsum >> 16);
1903 return xsum & 0xffff;
1904 }
1905
1906 int
1907 NetEthHdrSize(void)
1908 {
1909 ushort myvlanid;
1910
1911 myvlanid = ntohs(NetOurVLAN);
1912 if (myvlanid == (ushort)-1)
1913 myvlanid = VLAN_NONE;
1914
1915 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1916 VLAN_ETHER_HDR_SIZE;
1917 }
1918
1919 int
1920 NetSetEther(volatile uchar *xet, uchar * addr, uint prot)
1921 {
1922 Ethernet_t *et = (Ethernet_t *)xet;
1923 ushort myvlanid;
1924
1925 myvlanid = ntohs(NetOurVLAN);
1926 if (myvlanid == (ushort)-1)
1927 myvlanid = VLAN_NONE;
1928
1929 memcpy(et->et_dest, addr, 6);
1930 memcpy(et->et_src, NetOurEther, 6);
1931 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1932 et->et_protlen = htons(prot);
1933 return ETHER_HDR_SIZE;
1934 } else {
1935 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1936
1937 vet->vet_vlan_type = htons(PROT_VLAN);
1938 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1939 vet->vet_type = htons(prot);
1940 return VLAN_ETHER_HDR_SIZE;
1941 }
1942 }
1943
1944 void
1945 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1946 {
1947 IP_t *ip = (IP_t *)xip;
1948
1949 /*
1950 * If the data is an odd number of bytes, zero the
1951 * byte after the last byte so that the checksum
1952 * will work.
1953 */
1954 if (len & 1)
1955 xip[IP_HDR_SIZE + len] = 0;
1956
1957 /*
1958 * Construct an IP and UDP header.
1959 * (need to set no fragment bit - XXX)
1960 */
1961 /* IP_HDR_SIZE / 4 (not including UDP) */
1962 ip->ip_hl_v = 0x45;
1963 ip->ip_tos = 0;
1964 ip->ip_len = htons(IP_HDR_SIZE + len);
1965 ip->ip_id = htons(NetIPID++);
1966 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1967 ip->ip_ttl = 255;
1968 ip->ip_p = 17; /* UDP */
1969 ip->ip_sum = 0;
1970 /* already in network byte order */
1971 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1972 /* - "" - */
1973 NetCopyIP((void *)&ip->ip_dst, &dest);
1974 ip->udp_src = htons(sport);
1975 ip->udp_dst = htons(dport);
1976 ip->udp_len = htons(8 + len);
1977 ip->udp_xsum = 0;
1978 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1979 }
1980
1981 void copy_filename(char *dst, const char *src, int size)
1982 {
1983 if (*src && (*src == '"')) {
1984 ++src;
1985 --size;
1986 }
1987
1988 while ((--size > 0) && *src && (*src != '"'))
1989 *dst++ = *src++;
1990 *dst = '\0';
1991 }
1992
1993 #if defined(CONFIG_CMD_NFS) || \
1994 defined(CONFIG_CMD_SNTP) || \
1995 defined(CONFIG_CMD_DNS)
1996 /*
1997 * make port a little random (1024-17407)
1998 * This keeps the math somewhat trivial to compute, and seems to work with
1999 * all supported protocols/clients/servers
2000 */
2001 unsigned int random_port(void)
2002 {
2003 return 1024 + (get_timer(0) % 0x4000);
2004 }
2005 #endif
2006
2007 void ip_to_string(IPaddr_t x, char *s)
2008 {
2009 x = ntohl(x);
2010 sprintf(s, "%d.%d.%d.%d",
2011 (int) ((x >> 24) & 0xff),
2012 (int) ((x >> 16) & 0xff),
2013 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
2014 );
2015 }
2016
2017 void VLAN_to_string(ushort x, char *s)
2018 {
2019 x = ntohs(x);
2020
2021 if (x == (ushort)-1)
2022 x = VLAN_NONE;
2023
2024 if (x == VLAN_NONE)
2025 strcpy(s, "none");
2026 else
2027 sprintf(s, "%d", x & VLAN_IDMASK);
2028 }
2029
2030 ushort string_to_VLAN(const char *s)
2031 {
2032 ushort id;
2033
2034 if (s == NULL)
2035 return htons(VLAN_NONE);
2036
2037 if (*s < '0' || *s > '9')
2038 id = VLAN_NONE;
2039 else
2040 id = (ushort)simple_strtoul(s, NULL, 10);
2041
2042 return htons(id);
2043 }
2044
2045 ushort getenv_VLAN(char *var)
2046 {
2047 return string_to_VLAN(getenv(var));
2048 }
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