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[u-boot] / net / net.c
1 /*
2  *      Copied from Linux Monitor (LiMon) - Networking.
3  *
4  *      Copyright 1994 - 2000 Neil Russell.
5  *      (See License)
6  *      Copyright 2000 Roland Borde
7  *      Copyright 2000 Paolo Scaffardi
8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9  */
10
11 /*
12  * General Desription:
13  *
14  * The user interface supports commands for BOOTP, RARP, and TFTP.
15  * Also, we support ARP internally. Depending on available data,
16  * these interact as follows:
17  *
18  * BOOTP:
19  *
20  *      Prerequisites:  - own ethernet address
21  *      We want:        - own IP address
22  *                      - TFTP server IP address
23  *                      - name of bootfile
24  *      Next step:      ARP
25  *
26  * RARP:
27  *
28  *      Prerequisites:  - own ethernet address
29  *      We want:        - own IP address
30  *                      - TFTP server IP address
31  *      Next step:      ARP
32  *
33  * ARP:
34  *
35  *      Prerequisites:  - own ethernet address
36  *                      - own IP address
37  *                      - TFTP server IP address
38  *      We want:        - TFTP server ethernet address
39  *      Next step:      TFTP
40  *
41  * DHCP:
42  *
43  *     Prerequisites:   - own ethernet address
44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
45  *                      - bootfilename, lease time
46  *     Next step:       - TFTP
47  *
48  * TFTP:
49  *
50  *      Prerequisites:  - own ethernet address
51  *                      - own IP address
52  *                      - TFTP server IP address
53  *                      - TFTP server ethernet address
54  *                      - name of bootfile (if unknown, we use a default name
55  *                        derived from our own IP address)
56  *      We want:        - load the boot file
57  *      Next step:      none
58  *
59  * NFS:
60  *
61  *      Prerequisites:  - own ethernet address
62  *                      - own IP address
63  *                      - name of bootfile (if unknown, we use a default name
64  *                        derived from our own IP address)
65  *      We want:        - load the boot file
66  *      Next step:      none
67  *
68  * SNTP:
69  *
70  *      Prerequisites:  - own ethernet address
71  *                      - own IP address
72  *      We want:        - network time
73  *      Next step:      none
74  */
75
76
77 #include <common.h>
78 #include <watchdog.h>
79 #include <command.h>
80 #include <net.h>
81 #include "bootp.h"
82 #include "tftp.h"
83 #include "rarp.h"
84 #include "nfs.h"
85 #ifdef CONFIG_STATUS_LED
86 #include <status_led.h>
87 #include <miiphy.h>
88 #endif
89 #if defined(CONFIG_CMD_SNTP)
90 #include "sntp.h"
91 #endif
92 #if defined(CONFIG_CDP_VERSION)
93 #include <timestamp.h>
94 #endif
95 #if defined(CONFIG_CMD_DNS)
96 #include "dns.h"
97 #endif
98
99 DECLARE_GLOBAL_DATA_PTR;
100
101 #ifndef CONFIG_ARP_TIMEOUT
102 # define ARP_TIMEOUT            5000UL  /* Milliseconds before trying ARP again */
103 #else
104 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
105 #endif
106
107
108 #ifndef CONFIG_NET_RETRY_COUNT
109 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
110 #else
111 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
112 #endif
113
114 /** BOOTP EXTENTIONS **/
115
116 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
117 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
118 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
119 #if defined(CONFIG_BOOTP_DNS2)
120 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
121 #endif
122 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
123 char            NetOurHostName[32]={0,};        /* Our hostname                 */
124 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
125 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
126
127 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
128 IPaddr_t Mcast_addr;
129 #endif
130
131 /** END OF BOOTP EXTENTIONS **/
132
133 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
134 uchar           NetOurEther[6];         /* Our ethernet address                 */
135 uchar           NetServerEther[6] =     /* Boot server enet address             */
136                         { 0, 0, 0, 0, 0, 0 };
137 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
138 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
139 volatile uchar *NetRxPacket;            /* Current receive packet               */
140 int             NetRxPacketLen;         /* Current rx packet length             */
141 unsigned        NetIPID;                /* IP packet ID                         */
142 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
143                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
144 uchar           NetEtherNullAddr[6] =
145                         { 0, 0, 0, 0, 0, 0 };
146 #ifdef CONFIG_API
147 void            (*push_packet)(volatile void *, int len) = 0;
148 #endif
149 #if defined(CONFIG_CMD_CDP)
150 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
151                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
152 #endif
153 int             NetState;               /* Network loop state                   */
154 #ifdef CONFIG_NET_MULTI
155 int             NetRestartWrap = 0;     /* Tried all network devices            */
156 static int      NetRestarted = 0;       /* Network loop restarted               */
157 static int      NetDevExists = 0;       /* At least one device configured       */
158 #endif
159
160 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
161 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
162 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
163
164 char            BootFile[128];          /* Boot File name                       */
165
166 #if defined(CONFIG_CMD_PING)
167 IPaddr_t        NetPingIP;              /* the ip address to ping               */
168
169 static void PingStart(void);
170 #endif
171
172 #if defined(CONFIG_CMD_CDP)
173 static void CDPStart(void);
174 #endif
175
176 #if defined(CONFIG_CMD_SNTP)
177 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
178 int             NetTimeOffset=0;        /* offset time from UTC                 */
179 #endif
180
181 #ifdef CONFIG_NETCONSOLE
182 void NcStart(void);
183 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
184 #endif
185
186 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
187
188 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
189
190 static rxhand_f *packetHandler;         /* Current RX packet handler            */
191 static thand_f *timeHandler;            /* Current timeout handler              */
192 static ulong    timeStart;              /* Time base value                      */
193 static ulong    timeDelta;              /* Current timeout value                */
194 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
195
196 static int net_check_prereq (proto_t protocol);
197
198 static int NetTryCount;
199
200 /**********************************************************************/
201
202 IPaddr_t        NetArpWaitPacketIP;
203 IPaddr_t        NetArpWaitReplyIP;
204 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
205 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
206 int             NetArpWaitTxPacketSize;
207 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
208 ulong           NetArpWaitTimerStart;
209 int             NetArpWaitTry;
210
211 void ArpRequest (void)
212 {
213         int i;
214         volatile uchar *pkt;
215         ARP_t *arp;
216
217         debug("ARP broadcast %d\n", NetArpWaitTry);
218
219         pkt = NetTxPacket;
220
221         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
222
223         arp = (ARP_t *) pkt;
224
225         arp->ar_hrd = htons (ARP_ETHER);
226         arp->ar_pro = htons (PROT_IP);
227         arp->ar_hln = 6;
228         arp->ar_pln = 4;
229         arp->ar_op = htons (ARPOP_REQUEST);
230
231         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
232         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
233         for (i = 10; i < 16; ++i) {
234                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
235         }
236
237         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
238             (NetOurIP & NetOurSubnetMask)) {
239                 if (NetOurGatewayIP == 0) {
240                         puts ("## Warning: gatewayip needed but not set\n");
241                         NetArpWaitReplyIP = NetArpWaitPacketIP;
242                 } else {
243                         NetArpWaitReplyIP = NetOurGatewayIP;
244                 }
245         } else {
246                 NetArpWaitReplyIP = NetArpWaitPacketIP;
247         }
248
249         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
250         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
251 }
252
253 void ArpTimeoutCheck(void)
254 {
255         ulong t;
256
257         if (!NetArpWaitPacketIP)
258                 return;
259
260         t = get_timer(0);
261
262         /* check for arp timeout */
263         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
264                 NetArpWaitTry++;
265
266                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
267                         puts ("\nARP Retry count exceeded; starting again\n");
268                         NetArpWaitTry = 0;
269                         NetStartAgain();
270                 } else {
271                         NetArpWaitTimerStart = t;
272                         ArpRequest();
273                 }
274         }
275 }
276
277 static void
278 NetInitLoop(proto_t protocol)
279 {
280         static int env_changed_id = 0;
281         bd_t *bd = gd->bd;
282         int env_id = get_env_id ();
283
284         /* update only when the environment has changed */
285         if (env_changed_id != env_id) {
286                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
287                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
288                 NetOurSubnetMask= getenv_IPaddr ("netmask");
289                 NetServerIP = getenv_IPaddr ("serverip");
290                 NetOurNativeVLAN = getenv_VLAN("nvlan");
291                 NetOurVLAN = getenv_VLAN("vlan");
292 #if defined(CONFIG_CMD_DNS)
293                 NetOurDNSIP = getenv_IPaddr("dnsip");
294 #endif
295                 env_changed_id = env_id;
296         }
297
298         return;
299 }
300
301 /**********************************************************************/
302 /*
303  *      Main network processing loop.
304  */
305
306 int
307 NetLoop(proto_t protocol)
308 {
309         bd_t *bd = gd->bd;
310
311 #ifdef CONFIG_NET_MULTI
312         NetRestarted = 0;
313         NetDevExists = 0;
314 #endif
315
316         /* XXX problem with bss workaround */
317         NetArpWaitPacketMAC = NULL;
318         NetArpWaitTxPacket = NULL;
319         NetArpWaitPacketIP = 0;
320         NetArpWaitReplyIP = 0;
321         NetArpWaitTxPacket = NULL;
322         NetTxPacket = NULL;
323         NetTryCount = 1;
324
325         if (!NetTxPacket) {
326                 int     i;
327                 /*
328                  *      Setup packet buffers, aligned correctly.
329                  */
330                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
331                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
332                 for (i = 0; i < PKTBUFSRX; i++) {
333                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
334                 }
335         }
336
337         if (!NetArpWaitTxPacket) {
338                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
339                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
340                 NetArpWaitTxPacketSize = 0;
341         }
342
343         eth_halt();
344 #ifdef CONFIG_NET_MULTI
345         eth_set_current();
346 #endif
347         if (eth_init(bd) < 0) {
348                 eth_halt();
349                 return(-1);
350         }
351
352 restart:
353 #ifdef CONFIG_NET_MULTI
354         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
355 #else
356         eth_getenv_enetaddr("ethaddr", NetOurEther);
357 #endif
358
359         NetState = NETLOOP_CONTINUE;
360
361         /*
362          *      Start the ball rolling with the given start function.  From
363          *      here on, this code is a state machine driven by received
364          *      packets and timer events.
365          */
366         NetInitLoop(protocol);
367
368         switch (net_check_prereq (protocol)) {
369         case 1:
370                 /* network not configured */
371                 eth_halt();
372                 return (-1);
373
374 #ifdef CONFIG_NET_MULTI
375         case 2:
376                 /* network device not configured */
377                 break;
378 #endif /* CONFIG_NET_MULTI */
379
380         case 0:
381 #ifdef CONFIG_NET_MULTI
382                 NetDevExists = 1;
383 #endif
384                 switch (protocol) {
385                 case TFTP:
386                         /* always use ARP to get server ethernet address */
387                         TftpStart();
388                         break;
389
390 #if defined(CONFIG_CMD_DHCP)
391                 case DHCP:
392                         BootpTry = 0;
393                         NetOurIP = 0;
394                         DhcpRequest();          /* Basically same as BOOTP */
395                         break;
396 #endif
397
398                 case BOOTP:
399                         BootpTry = 0;
400                         NetOurIP = 0;
401                         BootpRequest ();
402                         break;
403
404                 case RARP:
405                         RarpTry = 0;
406                         NetOurIP = 0;
407                         RarpRequest ();
408                         break;
409 #if defined(CONFIG_CMD_PING)
410                 case PING:
411                         PingStart();
412                         break;
413 #endif
414 #if defined(CONFIG_CMD_NFS)
415                 case NFS:
416                         NfsStart();
417                         break;
418 #endif
419 #if defined(CONFIG_CMD_CDP)
420                 case CDP:
421                         CDPStart();
422                         break;
423 #endif
424 #ifdef CONFIG_NETCONSOLE
425                 case NETCONS:
426                         NcStart();
427                         break;
428 #endif
429 #if defined(CONFIG_CMD_SNTP)
430                 case SNTP:
431                         SntpStart();
432                         break;
433 #endif
434 #if defined(CONFIG_CMD_DNS)
435                 case DNS:
436                         DnsStart();
437                         break;
438 #endif
439                 default:
440                         break;
441                 }
442
443                 NetBootFileXferSize = 0;
444                 break;
445         }
446
447 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
448 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
449         /*
450          * Echo the inverted link state to the fault LED.
451          */
452         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
453                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
454         } else {
455                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
456         }
457 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
458 #endif /* CONFIG_MII, ... */
459
460         /*
461          *      Main packet reception loop.  Loop receiving packets until
462          *      someone sets `NetState' to a state that terminates.
463          */
464         for (;;) {
465                 WATCHDOG_RESET();
466 #ifdef CONFIG_SHOW_ACTIVITY
467                 {
468                         extern void show_activity(int arg);
469                         show_activity(1);
470                 }
471 #endif
472                 /*
473                  *      Check the ethernet for a new packet.  The ethernet
474                  *      receive routine will process it.
475                  */
476                 eth_rx();
477
478                 /*
479                  *      Abort if ctrl-c was pressed.
480                  */
481                 if (ctrlc()) {
482                         eth_halt();
483                         puts ("\nAbort\n");
484                         return (-1);
485                 }
486
487                 ArpTimeoutCheck();
488
489                 /*
490                  *      Check for a timeout, and run the timeout handler
491                  *      if we have one.
492                  */
493                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
494                         thand_f *x;
495
496 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
497 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
498       defined(CONFIG_STATUS_LED) &&        \
499       defined(STATUS_LED_RED)
500                         /*
501                          * Echo the inverted link state to the fault LED.
502                          */
503                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
504                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
505                         } else {
506                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
507                         }
508 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
509 #endif /* CONFIG_MII, ... */
510                         x = timeHandler;
511                         timeHandler = (thand_f *)0;
512                         (*x)();
513                 }
514
515
516                 switch (NetState) {
517
518                 case NETLOOP_RESTART:
519 #ifdef CONFIG_NET_MULTI
520                         NetRestarted = 1;
521 #endif
522                         goto restart;
523
524                 case NETLOOP_SUCCESS:
525                         if (NetBootFileXferSize > 0) {
526                                 char buf[20];
527                                 printf("Bytes transferred = %ld (%lx hex)\n",
528                                         NetBootFileXferSize,
529                                         NetBootFileXferSize);
530                                 sprintf(buf, "%lX", NetBootFileXferSize);
531                                 setenv("filesize", buf);
532
533                                 sprintf(buf, "%lX", (unsigned long)load_addr);
534                                 setenv("fileaddr", buf);
535                         }
536                         eth_halt();
537                         return NetBootFileXferSize;
538
539                 case NETLOOP_FAIL:
540                         return (-1);
541                 }
542         }
543 }
544
545 /**********************************************************************/
546
547 static void
548 startAgainTimeout(void)
549 {
550         NetState = NETLOOP_RESTART;
551 }
552
553 static void
554 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
555 {
556         /* Totally ignore the packet */
557 }
558
559 void NetStartAgain (void)
560 {
561         char *nretry;
562         int retry_forever = 0;
563         unsigned long retrycnt = 0;
564
565         nretry = getenv("netretry");
566         if (nretry) {
567                 if (!strcmp(nretry, "yes"))
568                         retry_forever = 1;
569                 else if (!strcmp(nretry, "no"))
570                         retrycnt = 0;
571                 else if (!strcmp(nretry, "once"))
572                         retrycnt = 1;
573                 else
574                         retrycnt = simple_strtoul(nretry, NULL, 0);
575         } else
576                 retry_forever = 1;
577
578         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
579                 eth_halt();
580                 NetState = NETLOOP_FAIL;
581                 return;
582         }
583
584         NetTryCount++;
585
586 #ifndef CONFIG_NET_MULTI
587         NetSetTimeout (10000UL, startAgainTimeout);
588         NetSetHandler (startAgainHandler);
589 #else   /* !CONFIG_NET_MULTI*/
590         eth_halt ();
591 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
592         eth_try_another (!NetRestarted);
593 #endif
594         eth_init (gd->bd);
595         if (NetRestartWrap) {
596                 NetRestartWrap = 0;
597                 if (NetDevExists) {
598                         NetSetTimeout (10000UL, startAgainTimeout);
599                         NetSetHandler (startAgainHandler);
600                 } else {
601                         NetState = NETLOOP_FAIL;
602                 }
603         } else {
604                 NetState = NETLOOP_RESTART;
605         }
606 #endif  /* CONFIG_NET_MULTI */
607 }
608
609 /**********************************************************************/
610 /*
611  *      Miscelaneous bits.
612  */
613
614 void
615 NetSetHandler(rxhand_f * f)
616 {
617         packetHandler = f;
618 }
619
620
621 void
622 NetSetTimeout(ulong iv, thand_f * f)
623 {
624         if (iv == 0) {
625                 timeHandler = (thand_f *)0;
626         } else {
627                 timeHandler = f;
628                 timeStart = get_timer(0);
629                 timeDelta = iv;
630         }
631 }
632
633
634 void
635 NetSendPacket(volatile uchar * pkt, int len)
636 {
637         (void) eth_send(pkt, len);
638 }
639
640 int
641 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
642 {
643         uchar *pkt;
644
645         /* convert to new style broadcast */
646         if (dest == 0)
647                 dest = 0xFFFFFFFF;
648
649         /* if broadcast, make the ether address a broadcast and don't do ARP */
650         if (dest == 0xFFFFFFFF)
651                 ether = NetBcastAddr;
652
653         /* if MAC address was not discovered yet, save the packet and do an ARP request */
654         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
655
656                 debug("sending ARP for %08lx\n", dest);
657
658                 NetArpWaitPacketIP = dest;
659                 NetArpWaitPacketMAC = ether;
660
661                 pkt = NetArpWaitTxPacket;
662                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
663
664                 NetSetIP (pkt, dest, dport, sport, len);
665                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
666
667                 /* size of the waiting packet */
668                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
669
670                 /* and do the ARP request */
671                 NetArpWaitTry = 1;
672                 NetArpWaitTimerStart = get_timer(0);
673                 ArpRequest();
674                 return 1;       /* waiting */
675         }
676
677         debug("sending UDP to %08lx/%pM\n", dest, ether);
678
679         pkt = (uchar *)NetTxPacket;
680         pkt += NetSetEther (pkt, ether, PROT_IP);
681         NetSetIP (pkt, dest, dport, sport, len);
682         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
683
684         return 0;       /* transmitted */
685 }
686
687 #if defined(CONFIG_CMD_PING)
688 static ushort PingSeqNo;
689
690 int PingSend(void)
691 {
692         static uchar mac[6];
693         volatile IP_t *ip;
694         volatile ushort *s;
695         uchar *pkt;
696
697         /* XXX always send arp request */
698
699         memcpy(mac, NetEtherNullAddr, 6);
700
701         debug("sending ARP for %08lx\n", NetPingIP);
702
703         NetArpWaitPacketIP = NetPingIP;
704         NetArpWaitPacketMAC = mac;
705
706         pkt = NetArpWaitTxPacket;
707         pkt += NetSetEther(pkt, mac, PROT_IP);
708
709         ip = (volatile IP_t *)pkt;
710
711         /*
712          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
713          */
714         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
715         ip->ip_tos   = 0;
716         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
717         ip->ip_id    = htons(NetIPID++);
718         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
719         ip->ip_ttl   = 255;
720         ip->ip_p     = 0x01;            /* ICMP */
721         ip->ip_sum   = 0;
722         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
723         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
724         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
725
726         s = &ip->udp_src;               /* XXX ICMP starts here */
727         s[0] = htons(0x0800);           /* echo-request, code */
728         s[1] = 0;                       /* checksum */
729         s[2] = 0;                       /* identifier */
730         s[3] = htons(PingSeqNo++);      /* sequence number */
731         s[1] = ~NetCksum((uchar *)s, 8/2);
732
733         /* size of the waiting packet */
734         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
735
736         /* and do the ARP request */
737         NetArpWaitTry = 1;
738         NetArpWaitTimerStart = get_timer(0);
739         ArpRequest();
740         return 1;       /* waiting */
741 }
742
743 static void
744 PingTimeout (void)
745 {
746         eth_halt();
747         NetState = NETLOOP_FAIL;        /* we did not get the reply */
748 }
749
750 static void
751 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
752 {
753         IPaddr_t tmp;
754         volatile IP_t *ip = (volatile IP_t *)pkt;
755
756         tmp = NetReadIP((void *)&ip->ip_src);
757         if (tmp != NetPingIP)
758                 return;
759
760         NetState = NETLOOP_SUCCESS;
761 }
762
763 static void PingStart(void)
764 {
765 #if defined(CONFIG_NET_MULTI)
766         printf ("Using %s device\n", eth_get_name());
767 #endif  /* CONFIG_NET_MULTI */
768         NetSetTimeout (10000UL, PingTimeout);
769         NetSetHandler (PingHandler);
770
771         PingSend();
772 }
773 #endif
774
775 #if defined(CONFIG_CMD_CDP)
776
777 #define CDP_DEVICE_ID_TLV               0x0001
778 #define CDP_ADDRESS_TLV                 0x0002
779 #define CDP_PORT_ID_TLV                 0x0003
780 #define CDP_CAPABILITIES_TLV            0x0004
781 #define CDP_VERSION_TLV                 0x0005
782 #define CDP_PLATFORM_TLV                0x0006
783 #define CDP_NATIVE_VLAN_TLV             0x000a
784 #define CDP_APPLIANCE_VLAN_TLV          0x000e
785 #define CDP_TRIGGER_TLV                 0x000f
786 #define CDP_POWER_CONSUMPTION_TLV       0x0010
787 #define CDP_SYSNAME_TLV                 0x0014
788 #define CDP_SYSOBJECT_TLV               0x0015
789 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
790
791 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
792
793 static int CDPSeq;
794 static int CDPOK;
795
796 ushort CDPNativeVLAN;
797 ushort CDPApplianceVLAN;
798
799 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
800
801 static ushort CDP_compute_csum(const uchar *buff, ushort len)
802 {
803         ushort csum;
804         int     odd;
805         ulong   result = 0;
806         ushort  leftover;
807         ushort *p;
808
809         if (len > 0) {
810                 odd = 1 & (ulong)buff;
811                 if (odd) {
812                         result = *buff << 8;
813                         len--;
814                         buff++;
815                 }
816                 while (len > 1) {
817                         p = (ushort *)buff;
818                         result += *p++;
819                         buff = (uchar *)p;
820                         if (result & 0x80000000)
821                                 result = (result & 0xFFFF) + (result >> 16);
822                         len -= 2;
823                 }
824                 if (len) {
825                         leftover = (signed short)(*(const signed char *)buff);
826                         /* CISCO SUCKS big time! (and blows too):
827                          * CDP uses the IP checksum algorithm with a twist;
828                          * for the last byte it *sign* extends and sums.
829                          */
830                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
831                 }
832                 while (result >> 16)
833                         result = (result & 0xFFFF) + (result >> 16);
834
835                 if (odd)
836                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
837         }
838
839         /* add up 16-bit and 17-bit words for 17+c bits */
840         result = (result & 0xffff) + (result >> 16);
841         /* add up 16-bit and 2-bit for 16+c bit */
842         result = (result & 0xffff) + (result >> 16);
843         /* add up carry.. */
844         result = (result & 0xffff) + (result >> 16);
845
846         /* negate */
847         csum = ~(ushort)result;
848
849         /* run time endian detection */
850         if (csum != htons(csum))        /* little endian */
851                 csum = htons(csum);
852
853         return csum;
854 }
855
856 int CDPSendTrigger(void)
857 {
858         volatile uchar *pkt;
859         volatile ushort *s;
860         volatile ushort *cp;
861         Ethernet_t *et;
862         int len;
863         ushort chksum;
864 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
865     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
866         char buf[32];
867 #endif
868
869         pkt = NetTxPacket;
870         et = (Ethernet_t *)pkt;
871
872         /* NOTE: trigger sent not on any VLAN */
873
874         /* form ethernet header */
875         memcpy(et->et_dest, NetCDPAddr, 6);
876         memcpy(et->et_src, NetOurEther, 6);
877
878         pkt += ETHER_HDR_SIZE;
879
880         /* SNAP header */
881         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
882         pkt += sizeof(CDP_SNAP_hdr);
883
884         /* CDP header */
885         *pkt++ = 0x02;                          /* CDP version 2 */
886         *pkt++ = 180;                           /* TTL */
887         s = (volatile ushort *)pkt;
888         cp = s;
889         *s++ = htons(0);                        /* checksum (0 for later calculation) */
890
891         /* CDP fields */
892 #ifdef CONFIG_CDP_DEVICE_ID
893         *s++ = htons(CDP_DEVICE_ID_TLV);
894         *s++ = htons(CONFIG_CDP_DEVICE_ID);
895         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
896         memcpy((uchar *)s, buf, 16);
897         s += 16 / 2;
898 #endif
899
900 #ifdef CONFIG_CDP_PORT_ID
901         *s++ = htons(CDP_PORT_ID_TLV);
902         memset(buf, 0, sizeof(buf));
903         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
904         len = strlen(buf);
905         if (len & 1)    /* make it even */
906                 len++;
907         *s++ = htons(len + 4);
908         memcpy((uchar *)s, buf, len);
909         s += len / 2;
910 #endif
911
912 #ifdef CONFIG_CDP_CAPABILITIES
913         *s++ = htons(CDP_CAPABILITIES_TLV);
914         *s++ = htons(8);
915         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
916         s += 2;
917 #endif
918
919 #ifdef CONFIG_CDP_VERSION
920         *s++ = htons(CDP_VERSION_TLV);
921         memset(buf, 0, sizeof(buf));
922         strcpy(buf, CONFIG_CDP_VERSION);
923         len = strlen(buf);
924         if (len & 1)    /* make it even */
925                 len++;
926         *s++ = htons(len + 4);
927         memcpy((uchar *)s, buf, len);
928         s += len / 2;
929 #endif
930
931 #ifdef CONFIG_CDP_PLATFORM
932         *s++ = htons(CDP_PLATFORM_TLV);
933         memset(buf, 0, sizeof(buf));
934         strcpy(buf, CONFIG_CDP_PLATFORM);
935         len = strlen(buf);
936         if (len & 1)    /* make it even */
937                 len++;
938         *s++ = htons(len + 4);
939         memcpy((uchar *)s, buf, len);
940         s += len / 2;
941 #endif
942
943 #ifdef CONFIG_CDP_TRIGGER
944         *s++ = htons(CDP_TRIGGER_TLV);
945         *s++ = htons(8);
946         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
947         s += 2;
948 #endif
949
950 #ifdef CONFIG_CDP_POWER_CONSUMPTION
951         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
952         *s++ = htons(6);
953         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
954 #endif
955
956         /* length of ethernet packet */
957         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
958         et->et_protlen = htons(len);
959
960         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
961         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
962         if (chksum == 0)
963                 chksum = 0xFFFF;
964         *cp = htons(chksum);
965
966         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
967         return 0;
968 }
969
970 static void
971 CDPTimeout (void)
972 {
973         CDPSeq++;
974
975         if (CDPSeq < 3) {
976                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
977                 CDPSendTrigger();
978                 return;
979         }
980
981         /* if not OK try again */
982         if (!CDPOK)
983                 NetStartAgain();
984         else
985                 NetState = NETLOOP_SUCCESS;
986 }
987
988 static void
989 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
990 {
991         /* nothing */
992 }
993
994 static void
995 CDPHandler(const uchar * pkt, unsigned len)
996 {
997         const uchar *t;
998         const ushort *ss;
999         ushort type, tlen;
1000         uchar applid;
1001         ushort vlan, nvlan;
1002
1003         /* minimum size? */
1004         if (len < sizeof(CDP_SNAP_hdr) + 4)
1005                 goto pkt_short;
1006
1007         /* check for valid CDP SNAP header */
1008         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1009                 return;
1010
1011         pkt += sizeof(CDP_SNAP_hdr);
1012         len -= sizeof(CDP_SNAP_hdr);
1013
1014         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1015         if (pkt[0] < 0x02 || pkt[1] == 0)
1016                 return;
1017
1018         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1019         if (pkt[0] != 0x02)
1020                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1021                                 pkt[0] & 0xff);
1022
1023         if (CDP_compute_csum(pkt, len) != 0)
1024                 return;
1025
1026         pkt += 4;
1027         len -= 4;
1028
1029         vlan = htons(-1);
1030         nvlan = htons(-1);
1031         while (len > 0) {
1032                 if (len < 4)
1033                         goto pkt_short;
1034
1035                 ss = (const ushort *)pkt;
1036                 type = ntohs(ss[0]);
1037                 tlen = ntohs(ss[1]);
1038                 if (tlen > len) {
1039                         goto pkt_short;
1040                 }
1041
1042                 pkt += tlen;
1043                 len -= tlen;
1044
1045                 ss += 2;        /* point ss to the data of the TLV */
1046                 tlen -= 4;
1047
1048                 switch (type) {
1049                         case CDP_DEVICE_ID_TLV:
1050                                 break;
1051                         case CDP_ADDRESS_TLV:
1052                                 break;
1053                         case CDP_PORT_ID_TLV:
1054                                 break;
1055                         case CDP_CAPABILITIES_TLV:
1056                                 break;
1057                         case CDP_VERSION_TLV:
1058                                 break;
1059                         case CDP_PLATFORM_TLV:
1060                                 break;
1061                         case CDP_NATIVE_VLAN_TLV:
1062                                 nvlan = *ss;
1063                                 break;
1064                         case CDP_APPLIANCE_VLAN_TLV:
1065                                 t = (const uchar *)ss;
1066                                 while (tlen > 0) {
1067                                         if (tlen < 3)
1068                                                 goto pkt_short;
1069
1070                                         applid = t[0];
1071                                         ss = (const ushort *)(t + 1);
1072
1073 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1074                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1075                                                 vlan = *ss;
1076 #else
1077                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1078 #endif
1079                                         t += 3; tlen -= 3;
1080                                 }
1081                                 break;
1082                         case CDP_TRIGGER_TLV:
1083                                 break;
1084                         case CDP_POWER_CONSUMPTION_TLV:
1085                                 break;
1086                         case CDP_SYSNAME_TLV:
1087                                 break;
1088                         case CDP_SYSOBJECT_TLV:
1089                                 break;
1090                         case CDP_MANAGEMENT_ADDRESS_TLV:
1091                                 break;
1092                 }
1093         }
1094
1095         CDPApplianceVLAN = vlan;
1096         CDPNativeVLAN = nvlan;
1097
1098         CDPOK = 1;
1099         return;
1100
1101  pkt_short:
1102         printf("** CDP packet is too short\n");
1103         return;
1104 }
1105
1106 static void CDPStart(void)
1107 {
1108 #if defined(CONFIG_NET_MULTI)
1109         printf ("Using %s device\n", eth_get_name());
1110 #endif
1111         CDPSeq = 0;
1112         CDPOK = 0;
1113
1114         CDPNativeVLAN = htons(-1);
1115         CDPApplianceVLAN = htons(-1);
1116
1117         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1118         NetSetHandler (CDPDummyHandler);
1119
1120         CDPSendTrigger();
1121 }
1122 #endif
1123
1124 #ifdef CONFIG_IP_DEFRAG
1125 /*
1126  * This function collects fragments in a single packet, according
1127  * to the algorithm in RFC815. It returns NULL or the pointer to
1128  * a complete packet, in static storage
1129  */
1130 #ifndef CONFIG_NET_MAXDEFRAG
1131 #define CONFIG_NET_MAXDEFRAG 16384
1132 #endif
1133 /*
1134  * MAXDEFRAG, above, is chosen in the config file and  is real data
1135  * so we need to add the NFS overhead, which is more than TFTP.
1136  * To use sizeof in the internal unnamed structures, we need a real
1137  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1138  * The compiler doesn't complain nor allocates the actual structure
1139  */
1140 static struct rpc_t rpc_specimen;
1141 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1142
1143 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1144
1145 /*
1146  * this is the packet being assembled, either data or frag control.
1147  * Fragments go by 8 bytes, so this union must be 8 bytes long
1148  */
1149 struct hole {
1150         /* first_byte is address of this structure */
1151         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1152         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1153         u16 prev_hole;  /* index of prev, 0 == none */
1154         u16 unused;
1155 };
1156
1157 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1158 {
1159         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1160         static u16 first_hole, total_len;
1161         struct hole *payload, *thisfrag, *h, *newh;
1162         IP_t *localip = (IP_t *)pkt_buff;
1163         uchar *indata = (uchar *)ip;
1164         int offset8, start, len, done = 0;
1165         u16 ip_off = ntohs(ip->ip_off);
1166
1167         /* payload starts after IP header, this fragment is in there */
1168         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1169         offset8 =  (ip_off & IP_OFFS);
1170         thisfrag = payload + offset8;
1171         start = offset8 * 8;
1172         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1173
1174         if (start + len > IP_MAXUDP) /* fragment extends too far */
1175                 return NULL;
1176
1177         if (!total_len || localip->ip_id != ip->ip_id) {
1178                 /* new (or different) packet, reset structs */
1179                 total_len = 0xffff;
1180                 payload[0].last_byte = ~0;
1181                 payload[0].next_hole = 0;
1182                 payload[0].prev_hole = 0;
1183                 first_hole = 0;
1184                 /* any IP header will work, copy the first we received */
1185                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1186         }
1187
1188         /*
1189          * What follows is the reassembly algorithm. We use the payload
1190          * array as a linked list of hole descriptors, as each hole starts
1191          * at a multiple of 8 bytes. However, last byte can be whatever value,
1192          * so it is represented as byte count, not as 8-byte blocks.
1193          */
1194
1195         h = payload + first_hole;
1196         while (h->last_byte < start) {
1197                 if (!h->next_hole) {
1198                         /* no hole that far away */
1199                         return NULL;
1200                 }
1201                 h = payload + h->next_hole;
1202         }
1203
1204         if (offset8 + (len / 8) <= h - payload) {
1205                 /* no overlap with holes (dup fragment?) */
1206                 return NULL;
1207         }
1208
1209         if (!(ip_off & IP_FLAGS_MFRAG)) {
1210                 /* no more fragmentss: truncate this (last) hole */
1211                 total_len = start + len;
1212                 h->last_byte = start + len;
1213         }
1214
1215         /*
1216          * There is some overlap: fix the hole list. This code doesn't
1217          * deal with a fragment that overlaps with two different holes
1218          * (thus being a superset of a previously-received fragment).
1219          */
1220
1221         if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1222                 /* complete overlap with hole: remove hole */
1223                 if (!h->prev_hole && !h->next_hole) {
1224                         /* last remaining hole */
1225                         done = 1;
1226                 } else if (!h->prev_hole) {
1227                         /* first hole */
1228                         first_hole = h->next_hole;
1229                         payload[h->next_hole].prev_hole = 0;
1230                 } else if (!h->next_hole) {
1231                         /* last hole */
1232                         payload[h->prev_hole].next_hole = 0;
1233                 } else {
1234                         /* in the middle of the list */
1235                         payload[h->next_hole].prev_hole = h->prev_hole;
1236                         payload[h->prev_hole].next_hole = h->next_hole;
1237                 }
1238
1239         } else if (h->last_byte <= start + len) {
1240                 /* overlaps with final part of the hole: shorten this hole */
1241                 h->last_byte = start;
1242
1243         } else if (h >= thisfrag) {
1244                 /* overlaps with initial part of the hole: move this hole */
1245                 newh = thisfrag + (len / 8);
1246                 *newh = *h;
1247                 h = newh;
1248                 if (h->next_hole)
1249                         payload[h->next_hole].prev_hole = (h - payload);
1250                 if (h->prev_hole)
1251                         payload[h->prev_hole].next_hole = (h - payload);
1252                 else
1253                         first_hole = (h - payload);
1254
1255         } else {
1256                 /* fragment sits in the middle: split the hole */
1257                 newh = thisfrag + (len / 8);
1258                 *newh = *h;
1259                 h->last_byte = start;
1260                 h->next_hole = (newh - payload);
1261                 newh->prev_hole = (h - payload);
1262                 if (newh->next_hole)
1263                         payload[newh->next_hole].prev_hole = (newh - payload);
1264         }
1265
1266         /* finally copy this fragment and possibly return whole packet */
1267         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1268         if (!done)
1269                 return NULL;
1270
1271         localip->ip_len = htons(total_len);
1272         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1273         return localip;
1274 }
1275
1276 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1277 {
1278         u16 ip_off = ntohs(ip->ip_off);
1279         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1280                 return ip; /* not a fragment */
1281         return __NetDefragment(ip, lenp);
1282 }
1283
1284 #else /* !CONFIG_IP_DEFRAG */
1285
1286 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1287 {
1288         u16 ip_off = ntohs(ip->ip_off);
1289         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1290                 return ip; /* not a fragment */
1291         return NULL;
1292 }
1293 #endif
1294
1295 void
1296 NetReceive(volatile uchar * inpkt, int len)
1297 {
1298         Ethernet_t *et;
1299         IP_t    *ip;
1300         ARP_t   *arp;
1301         IPaddr_t tmp;
1302         int     x;
1303         uchar *pkt;
1304 #if defined(CONFIG_CMD_CDP)
1305         int iscdp;
1306 #endif
1307         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1308
1309         debug("packet received\n");
1310
1311         NetRxPacket = inpkt;
1312         NetRxPacketLen = len;
1313         et = (Ethernet_t *)inpkt;
1314
1315         /* too small packet? */
1316         if (len < ETHER_HDR_SIZE)
1317                 return;
1318
1319 #ifdef CONFIG_API
1320         if (push_packet) {
1321                 (*push_packet)(inpkt, len);
1322                 return;
1323         }
1324 #endif
1325
1326 #if defined(CONFIG_CMD_CDP)
1327         /* keep track if packet is CDP */
1328         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1329 #endif
1330
1331         myvlanid = ntohs(NetOurVLAN);
1332         if (myvlanid == (ushort)-1)
1333                 myvlanid = VLAN_NONE;
1334         mynvlanid = ntohs(NetOurNativeVLAN);
1335         if (mynvlanid == (ushort)-1)
1336                 mynvlanid = VLAN_NONE;
1337
1338         x = ntohs(et->et_protlen);
1339
1340         debug("packet received\n");
1341
1342         if (x < 1514) {
1343                 /*
1344                  *      Got a 802 packet.  Check the other protocol field.
1345                  */
1346                 x = ntohs(et->et_prot);
1347
1348                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1349                 len -= E802_HDR_SIZE;
1350
1351         } else if (x != PROT_VLAN) {    /* normal packet */
1352                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1353                 len -= ETHER_HDR_SIZE;
1354
1355         } else {                        /* VLAN packet */
1356                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1357
1358                 debug("VLAN packet received\n");
1359
1360                 /* too small packet? */
1361                 if (len < VLAN_ETHER_HDR_SIZE)
1362                         return;
1363
1364                 /* if no VLAN active */
1365                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1366 #if defined(CONFIG_CMD_CDP)
1367                                 && iscdp == 0
1368 #endif
1369                                 )
1370                         return;
1371
1372                 cti = ntohs(vet->vet_tag);
1373                 vlanid = cti & VLAN_IDMASK;
1374                 x = ntohs(vet->vet_type);
1375
1376                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1377                 len -= VLAN_ETHER_HDR_SIZE;
1378         }
1379
1380         debug("Receive from protocol 0x%x\n", x);
1381
1382 #if defined(CONFIG_CMD_CDP)
1383         if (iscdp) {
1384                 CDPHandler((uchar *)ip, len);
1385                 return;
1386         }
1387 #endif
1388
1389         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1390                 if (vlanid == VLAN_NONE)
1391                         vlanid = (mynvlanid & VLAN_IDMASK);
1392                 /* not matched? */
1393                 if (vlanid != (myvlanid & VLAN_IDMASK))
1394                         return;
1395         }
1396
1397         switch (x) {
1398
1399         case PROT_ARP:
1400                 /*
1401                  * We have to deal with two types of ARP packets:
1402                  * - REQUEST packets will be answered by sending  our
1403                  *   IP address - if we know it.
1404                  * - REPLY packates are expected only after we asked
1405                  *   for the TFTP server's or the gateway's ethernet
1406                  *   address; so if we receive such a packet, we set
1407                  *   the server ethernet address
1408                  */
1409                 debug("Got ARP\n");
1410
1411                 arp = (ARP_t *)ip;
1412                 if (len < ARP_HDR_SIZE) {
1413                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1414                         return;
1415                 }
1416                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1417                         return;
1418                 }
1419                 if (ntohs(arp->ar_pro) != PROT_IP) {
1420                         return;
1421                 }
1422                 if (arp->ar_hln != 6) {
1423                         return;
1424                 }
1425                 if (arp->ar_pln != 4) {
1426                         return;
1427                 }
1428
1429                 if (NetOurIP == 0) {
1430                         return;
1431                 }
1432
1433                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1434                         return;
1435                 }
1436
1437                 switch (ntohs(arp->ar_op)) {
1438                 case ARPOP_REQUEST:             /* reply with our IP address    */
1439                         debug("Got ARP REQUEST, return our IP\n");
1440                         pkt = (uchar *)et;
1441                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1442                         arp->ar_op = htons(ARPOP_REPLY);
1443                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1444                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1445                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1446                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1447                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1448                         return;
1449
1450                 case ARPOP_REPLY:               /* arp reply */
1451                         /* are we waiting for a reply */
1452                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1453                                 break;
1454
1455 #ifdef CONFIG_KEEP_SERVERADDR
1456                         if (NetServerIP == NetArpWaitPacketIP) {
1457                                 char buf[20];
1458                                 sprintf(buf, "%pM", arp->ar_data);
1459                                 setenv("serveraddr", buf);
1460                         }
1461 #endif
1462
1463                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1464                                 arp->ar_data);
1465
1466                         tmp = NetReadIP(&arp->ar_data[6]);
1467
1468                         /* matched waiting packet's address */
1469                         if (tmp == NetArpWaitReplyIP) {
1470                                 debug("Got it\n");
1471                                 /* save address for later use */
1472                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1473
1474 #ifdef CONFIG_NETCONSOLE
1475                                 (*packetHandler)(0,0,0,0);
1476 #endif
1477                                 /* modify header, and transmit it */
1478                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1479                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1480
1481                                 /* no arp request pending now */
1482                                 NetArpWaitPacketIP = 0;
1483                                 NetArpWaitTxPacketSize = 0;
1484                                 NetArpWaitPacketMAC = NULL;
1485
1486                         }
1487                         return;
1488                 default:
1489                         debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1490                         return;
1491                 }
1492                 break;
1493
1494         case PROT_RARP:
1495                 debug("Got RARP\n");
1496                 arp = (ARP_t *)ip;
1497                 if (len < ARP_HDR_SIZE) {
1498                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1499                         return;
1500                 }
1501
1502                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1503                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1504                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1505                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1506
1507                         puts ("invalid RARP header\n");
1508                 } else {
1509                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1510                         if (NetServerIP == 0)
1511                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1512                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1513
1514                         (*packetHandler)(0,0,0,0);
1515                 }
1516                 break;
1517
1518         case PROT_IP:
1519                 debug("Got IP\n");
1520                 /* Before we start poking the header, make sure it is there */
1521                 if (len < IP_HDR_SIZE) {
1522                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1523                         return;
1524                 }
1525                 /* Check the packet length */
1526                 if (len < ntohs(ip->ip_len)) {
1527                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1528                         return;
1529                 }
1530                 len = ntohs(ip->ip_len);
1531                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1532
1533                 /* Can't deal with anything except IPv4 */
1534                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1535                         return;
1536                 }
1537                 /* Can't deal with IP options (headers != 20 bytes) */
1538                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1539                         return;
1540                 }
1541                 /* Check the Checksum of the header */
1542                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1543                         puts ("checksum bad\n");
1544                         return;
1545                 }
1546                 /* If it is not for us, ignore it */
1547                 tmp = NetReadIP(&ip->ip_dst);
1548                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1549 #ifdef CONFIG_MCAST_TFTP
1550                         if (Mcast_addr != tmp)
1551 #endif
1552                         return;
1553                 }
1554                 /*
1555                  * The function returns the unchanged packet if it's not
1556                  * a fragment, and either the complete packet or NULL if
1557                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1558                  */
1559                 if (!(ip = NetDefragment(ip, &len)))
1560                         return;
1561                 /*
1562                  * watch for ICMP host redirects
1563                  *
1564                  * There is no real handler code (yet). We just watch
1565                  * for ICMP host redirect messages. In case anybody
1566                  * sees these messages: please contact me
1567                  * (wd@denx.de), or - even better - send me the
1568                  * necessary fixes :-)
1569                  *
1570                  * Note: in all cases where I have seen this so far
1571                  * it was a problem with the router configuration,
1572                  * for instance when a router was configured in the
1573                  * BOOTP reply, but the TFTP server was on the same
1574                  * subnet. So this is probably a warning that your
1575                  * configuration might be wrong. But I'm not really
1576                  * sure if there aren't any other situations.
1577                  */
1578                 if (ip->ip_p == IPPROTO_ICMP) {
1579                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1580
1581                         switch (icmph->type) {
1582                         case ICMP_REDIRECT:
1583                                 if (icmph->code != ICMP_REDIR_HOST)
1584                                         return;
1585                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1586                                 return;
1587 #if defined(CONFIG_CMD_PING)
1588                         case ICMP_ECHO_REPLY:
1589                                 /*
1590                                  *      IP header OK.  Pass the packet to the current handler.
1591                                  */
1592                                 /* XXX point to ip packet */
1593                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1594                                 return;
1595                         case ICMP_ECHO_REQUEST:
1596                                 debug("Got ICMP ECHO REQUEST, return %d bytes \n",
1597                                         ETHER_HDR_SIZE + len);
1598
1599                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1600                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1601
1602                                 ip->ip_sum = 0;
1603                                 ip->ip_off = 0;
1604                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1605                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1606                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1607
1608                                 icmph->type = ICMP_ECHO_REPLY;
1609                                 icmph->checksum = 0;
1610                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1611                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1612                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1613                                 return;
1614 #endif
1615                         default:
1616                                 return;
1617                         }
1618                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1619                         return;
1620                 }
1621
1622 #ifdef CONFIG_UDP_CHECKSUM
1623                 if (ip->udp_xsum != 0) {
1624                         ulong   xsum;
1625                         ushort *sumptr;
1626                         ushort  sumlen;
1627
1628                         xsum  = ip->ip_p;
1629                         xsum += (ntohs(ip->udp_len));
1630                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1631                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1632                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1633                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1634
1635                         sumlen = ntohs(ip->udp_len);
1636                         sumptr = (ushort *) &(ip->udp_src);
1637
1638                         while (sumlen > 1) {
1639                                 ushort sumdata;
1640
1641                                 sumdata = *sumptr++;
1642                                 xsum += ntohs(sumdata);
1643                                 sumlen -= 2;
1644                         }
1645                         if (sumlen > 0) {
1646                                 ushort sumdata;
1647
1648                                 sumdata = *(unsigned char *) sumptr;
1649                                 sumdata = (sumdata << 8) & 0xff00;
1650                                 xsum += sumdata;
1651                         }
1652                         while ((xsum >> 16) != 0) {
1653                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1654                         }
1655                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1656                                 printf(" UDP wrong checksum %08lx %08x\n",
1657                                         xsum, ntohs(ip->udp_xsum));
1658                                 return;
1659                         }
1660                 }
1661 #endif
1662
1663
1664 #ifdef CONFIG_NETCONSOLE
1665                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1666                                                 ntohs(ip->udp_dst),
1667                                                 ntohs(ip->udp_src),
1668                                                 ntohs(ip->udp_len) - 8);
1669 #endif
1670                 /*
1671                  *      IP header OK.  Pass the packet to the current handler.
1672                  */
1673                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1674                                                 ntohs(ip->udp_dst),
1675                                                 ntohs(ip->udp_src),
1676                                                 ntohs(ip->udp_len) - 8);
1677                 break;
1678         }
1679 }
1680
1681
1682 /**********************************************************************/
1683
1684 static int net_check_prereq (proto_t protocol)
1685 {
1686         switch (protocol) {
1687                 /* Fall through */
1688 #if defined(CONFIG_CMD_PING)
1689         case PING:
1690                 if (NetPingIP == 0) {
1691                         puts ("*** ERROR: ping address not given\n");
1692                         return (1);
1693                 }
1694                 goto common;
1695 #endif
1696 #if defined(CONFIG_CMD_SNTP)
1697         case SNTP:
1698                 if (NetNtpServerIP == 0) {
1699                         puts ("*** ERROR: NTP server address not given\n");
1700                         return (1);
1701                 }
1702                 goto common;
1703 #endif
1704 #if defined(CONFIG_CMD_DNS)
1705         case DNS:
1706                 if (NetOurDNSIP == 0) {
1707                         puts("*** ERROR: DNS server address not given\n");
1708                         return 1;
1709                 }
1710                 goto common;
1711 #endif
1712 #if defined(CONFIG_CMD_NFS)
1713         case NFS:
1714 #endif
1715         case NETCONS:
1716         case TFTP:
1717                 if (NetServerIP == 0) {
1718                         puts ("*** ERROR: `serverip' not set\n");
1719                         return (1);
1720                 }
1721 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1722     common:
1723 #endif
1724
1725                 if (NetOurIP == 0) {
1726                         puts ("*** ERROR: `ipaddr' not set\n");
1727                         return (1);
1728                 }
1729                 /* Fall through */
1730
1731         case DHCP:
1732         case RARP:
1733         case BOOTP:
1734         case CDP:
1735                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1736 #ifdef CONFIG_NET_MULTI
1737                         extern int eth_get_dev_index (void);
1738                         int num = eth_get_dev_index ();
1739
1740                         switch (num) {
1741                         case -1:
1742                                 puts ("*** ERROR: No ethernet found.\n");
1743                                 return (1);
1744                         case 0:
1745                                 puts ("*** ERROR: `ethaddr' not set\n");
1746                                 break;
1747                         default:
1748                                 printf ("*** ERROR: `eth%daddr' not set\n",
1749                                         num);
1750                                 break;
1751                         }
1752
1753                         NetStartAgain ();
1754                         return (2);
1755 #else
1756                         puts ("*** ERROR: `ethaddr' not set\n");
1757                         return (1);
1758 #endif
1759                 }
1760                 /* Fall through */
1761         default:
1762                 return (0);
1763         }
1764         return (0);             /* OK */
1765 }
1766 /**********************************************************************/
1767
1768 int
1769 NetCksumOk(uchar * ptr, int len)
1770 {
1771         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1772 }
1773
1774
1775 unsigned
1776 NetCksum(uchar * ptr, int len)
1777 {
1778         ulong   xsum;
1779         ushort *p = (ushort *)ptr;
1780
1781         xsum = 0;
1782         while (len-- > 0)
1783                 xsum += *p++;
1784         xsum = (xsum & 0xffff) + (xsum >> 16);
1785         xsum = (xsum & 0xffff) + (xsum >> 16);
1786         return (xsum & 0xffff);
1787 }
1788
1789 int
1790 NetEthHdrSize(void)
1791 {
1792         ushort myvlanid;
1793
1794         myvlanid = ntohs(NetOurVLAN);
1795         if (myvlanid == (ushort)-1)
1796                 myvlanid = VLAN_NONE;
1797
1798         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1799 }
1800
1801 int
1802 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1803 {
1804         Ethernet_t *et = (Ethernet_t *)xet;
1805         ushort myvlanid;
1806
1807         myvlanid = ntohs(NetOurVLAN);
1808         if (myvlanid == (ushort)-1)
1809                 myvlanid = VLAN_NONE;
1810
1811         memcpy (et->et_dest, addr, 6);
1812         memcpy (et->et_src, NetOurEther, 6);
1813         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1814         et->et_protlen = htons(prot);
1815                 return ETHER_HDR_SIZE;
1816         } else {
1817                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1818
1819                 vet->vet_vlan_type = htons(PROT_VLAN);
1820                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1821                 vet->vet_type = htons(prot);
1822                 return VLAN_ETHER_HDR_SIZE;
1823         }
1824 }
1825
1826 void
1827 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1828 {
1829         IP_t *ip = (IP_t *)xip;
1830
1831         /*
1832          *      If the data is an odd number of bytes, zero the
1833          *      byte after the last byte so that the checksum
1834          *      will work.
1835          */
1836         if (len & 1)
1837                 xip[IP_HDR_SIZE + len] = 0;
1838
1839         /*
1840          *      Construct an IP and UDP header.
1841          *      (need to set no fragment bit - XXX)
1842          */
1843         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1844         ip->ip_tos   = 0;
1845         ip->ip_len   = htons(IP_HDR_SIZE + len);
1846         ip->ip_id    = htons(NetIPID++);
1847         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1848         ip->ip_ttl   = 255;
1849         ip->ip_p     = 17;              /* UDP */
1850         ip->ip_sum   = 0;
1851         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1852         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1853         ip->udp_src  = htons(sport);
1854         ip->udp_dst  = htons(dport);
1855         ip->udp_len  = htons(8 + len);
1856         ip->udp_xsum = 0;
1857         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1858 }
1859
1860 void copy_filename (char *dst, char *src, int size)
1861 {
1862         if (*src && (*src == '"')) {
1863                 ++src;
1864                 --size;
1865         }
1866
1867         while ((--size > 0) && *src && (*src != '"')) {
1868                 *dst++ = *src++;
1869         }
1870         *dst = '\0';
1871 }
1872
1873 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1874 /*
1875  * make port a little random, but use something trivial to compute
1876  */
1877 unsigned int random_port(void)
1878 {
1879         return 1024 + (get_timer(0) % 0x8000);;
1880 }
1881 #endif
1882
1883 void ip_to_string (IPaddr_t x, char *s)
1884 {
1885         x = ntohl (x);
1886         sprintf (s, "%d.%d.%d.%d",
1887                  (int) ((x >> 24) & 0xff),
1888                  (int) ((x >> 16) & 0xff),
1889                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1890         );
1891 }
1892
1893 IPaddr_t string_to_ip(char *s)
1894 {
1895         IPaddr_t addr;
1896         char *e;
1897         int i;
1898
1899         if (s == NULL)
1900                 return(0);
1901
1902         for (addr=0, i=0; i<4; ++i) {
1903                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1904                 addr <<= 8;
1905                 addr |= (val & 0xFF);
1906                 if (s) {
1907                         s = (*e) ? e+1 : e;
1908                 }
1909         }
1910
1911         return (htonl(addr));
1912 }
1913
1914 void VLAN_to_string(ushort x, char *s)
1915 {
1916         x = ntohs(x);
1917
1918         if (x == (ushort)-1)
1919                 x = VLAN_NONE;
1920
1921         if (x == VLAN_NONE)
1922                 strcpy(s, "none");
1923         else
1924                 sprintf(s, "%d", x & VLAN_IDMASK);
1925 }
1926
1927 ushort string_to_VLAN(char *s)
1928 {
1929         ushort id;
1930
1931         if (s == NULL)
1932                 return htons(VLAN_NONE);
1933
1934         if (*s < '0' || *s > '9')
1935                 id = VLAN_NONE;
1936         else
1937                 id = (ushort)simple_strtoul(s, NULL, 10);
1938
1939         return htons(id);
1940 }
1941
1942 IPaddr_t getenv_IPaddr (char *var)
1943 {
1944         return (string_to_ip(getenv(var)));
1945 }
1946
1947 ushort getenv_VLAN(char *var)
1948 {
1949         return (string_to_VLAN(getenv(var)));
1950 }