net: Make copy_filename() accept NULL src
[platform/kernel/u-boot.git] / net / net.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *      Copied from Linux Monitor (LiMon) - Networking.
4  *
5  *      Copyright 1994 - 2000 Neil Russell.
6  *      (See License)
7  *      Copyright 2000 Roland Borde
8  *      Copyright 2000 Paolo Scaffardi
9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
10  */
11
12 /*
13  * General Desription:
14  *
15  * The user interface supports commands for BOOTP, RARP, and TFTP.
16  * Also, we support ARP internally. Depending on available data,
17  * these interact as follows:
18  *
19  * BOOTP:
20  *
21  *      Prerequisites:  - own ethernet address
22  *      We want:        - own IP address
23  *                      - TFTP server IP address
24  *                      - name of bootfile
25  *      Next step:      ARP
26  *
27  * LINK_LOCAL:
28  *
29  *      Prerequisites:  - own ethernet address
30  *      We want:        - own IP address
31  *      Next step:      ARP
32  *
33  * RARP:
34  *
35  *      Prerequisites:  - own ethernet address
36  *      We want:        - own IP address
37  *                      - TFTP server IP address
38  *      Next step:      ARP
39  *
40  * ARP:
41  *
42  *      Prerequisites:  - own ethernet address
43  *                      - own IP address
44  *                      - TFTP server IP address
45  *      We want:        - TFTP server ethernet address
46  *      Next step:      TFTP
47  *
48  * DHCP:
49  *
50  *     Prerequisites:   - own ethernet address
51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
52  *                      - bootfilename, lease time
53  *     Next step:       - TFTP
54  *
55  * TFTP:
56  *
57  *      Prerequisites:  - own ethernet address
58  *                      - own IP address
59  *                      - TFTP server IP address
60  *                      - TFTP server ethernet address
61  *                      - name of bootfile (if unknown, we use a default name
62  *                        derived from our own IP address)
63  *      We want:        - load the boot file
64  *      Next step:      none
65  *
66  * NFS:
67  *
68  *      Prerequisites:  - own ethernet address
69  *                      - own IP address
70  *                      - name of bootfile (if unknown, we use a default name
71  *                        derived from our own IP address)
72  *      We want:        - load the boot file
73  *      Next step:      none
74  *
75  * SNTP:
76  *
77  *      Prerequisites:  - own ethernet address
78  *                      - own IP address
79  *      We want:        - network time
80  *      Next step:      none
81  *
82  * WOL:
83  *
84  *      Prerequisites:  - own ethernet address
85  *      We want:        - magic packet or timeout
86  *      Next step:      none
87  */
88
89
90 #include <common.h>
91 #include <command.h>
92 #include <console.h>
93 #include <environment.h>
94 #include <errno.h>
95 #include <net.h>
96 #include <net/fastboot.h>
97 #include <net/tftp.h>
98 #if defined(CONFIG_LED_STATUS)
99 #include <miiphy.h>
100 #include <status_led.h>
101 #endif
102 #include <watchdog.h>
103 #include <linux/compiler.h>
104 #include "arp.h"
105 #include "bootp.h"
106 #include "cdp.h"
107 #if defined(CONFIG_CMD_DNS)
108 #include "dns.h"
109 #endif
110 #include "link_local.h"
111 #include "nfs.h"
112 #include "ping.h"
113 #include "rarp.h"
114 #if defined(CONFIG_CMD_SNTP)
115 #include "sntp.h"
116 #endif
117 #if defined(CONFIG_CMD_WOL)
118 #include "wol.h"
119 #endif
120
121 /** BOOTP EXTENTIONS **/
122
123 /* Our subnet mask (0=unknown) */
124 struct in_addr net_netmask;
125 /* Our gateways IP address */
126 struct in_addr net_gateway;
127 /* Our DNS IP address */
128 struct in_addr net_dns_server;
129 #if defined(CONFIG_BOOTP_DNS2)
130 /* Our 2nd DNS IP address */
131 struct in_addr net_dns_server2;
132 #endif
133
134 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
135 struct in_addr net_mcast_addr;
136 #endif
137
138 /** END OF BOOTP EXTENTIONS **/
139
140 /* Our ethernet address */
141 u8 net_ethaddr[6];
142 /* Boot server enet address */
143 u8 net_server_ethaddr[6];
144 /* Our IP addr (0 = unknown) */
145 struct in_addr  net_ip;
146 /* Server IP addr (0 = unknown) */
147 struct in_addr  net_server_ip;
148 /* Current receive packet */
149 uchar *net_rx_packet;
150 /* Current rx packet length */
151 int             net_rx_packet_len;
152 /* IP packet ID */
153 static unsigned net_ip_id;
154 /* Ethernet bcast address */
155 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
156 const u8 net_null_ethaddr[6];
157 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
158 void (*push_packet)(void *, int len) = 0;
159 #endif
160 /* Network loop state */
161 enum net_loop_state net_state;
162 /* Tried all network devices */
163 int             net_restart_wrap;
164 /* Network loop restarted */
165 static int      net_restarted;
166 /* At least one device configured */
167 static int      net_dev_exists;
168
169 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
170 /* default is without VLAN */
171 ushort          net_our_vlan = 0xFFFF;
172 /* ditto */
173 ushort          net_native_vlan = 0xFFFF;
174
175 /* Boot File name */
176 char net_boot_file_name[1024];
177 /* Indicates whether the file name was specified on the command line */
178 bool net_boot_file_name_explicit;
179 /* The actual transferred size of the bootfile (in bytes) */
180 u32 net_boot_file_size;
181 /* Boot file size in blocks as reported by the DHCP server */
182 u32 net_boot_file_expected_size_in_blocks;
183
184 #if defined(CONFIG_CMD_SNTP)
185 /* NTP server IP address */
186 struct in_addr  net_ntp_server;
187 /* offset time from UTC */
188 int             net_ntp_time_offset;
189 #endif
190
191 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
192 /* Receive packets */
193 uchar *net_rx_packets[PKTBUFSRX];
194 /* Current UDP RX packet handler */
195 static rxhand_f *udp_packet_handler;
196 /* Current ARP RX packet handler */
197 static rxhand_f *arp_packet_handler;
198 #ifdef CONFIG_CMD_TFTPPUT
199 /* Current ICMP rx handler */
200 static rxhand_icmp_f *packet_icmp_handler;
201 #endif
202 /* Current timeout handler */
203 static thand_f *time_handler;
204 /* Time base value */
205 static ulong    time_start;
206 /* Current timeout value */
207 static ulong    time_delta;
208 /* THE transmit packet */
209 uchar *net_tx_packet;
210
211 static int net_check_prereq(enum proto_t protocol);
212
213 static int net_try_count;
214
215 int __maybe_unused net_busy_flag;
216
217 /**********************************************************************/
218
219 static int on_bootfile(const char *name, const char *value, enum env_op op,
220         int flags)
221 {
222         if (flags & H_PROGRAMMATIC)
223                 return 0;
224
225         switch (op) {
226         case env_op_create:
227         case env_op_overwrite:
228                 copy_filename(net_boot_file_name, value,
229                               sizeof(net_boot_file_name));
230                 break;
231         default:
232                 break;
233         }
234
235         return 0;
236 }
237 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
238
239 static int on_ipaddr(const char *name, const char *value, enum env_op op,
240         int flags)
241 {
242         if (flags & H_PROGRAMMATIC)
243                 return 0;
244
245         net_ip = string_to_ip(value);
246
247         return 0;
248 }
249 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
250
251 static int on_gatewayip(const char *name, const char *value, enum env_op op,
252         int flags)
253 {
254         if (flags & H_PROGRAMMATIC)
255                 return 0;
256
257         net_gateway = string_to_ip(value);
258
259         return 0;
260 }
261 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
262
263 static int on_netmask(const char *name, const char *value, enum env_op op,
264         int flags)
265 {
266         if (flags & H_PROGRAMMATIC)
267                 return 0;
268
269         net_netmask = string_to_ip(value);
270
271         return 0;
272 }
273 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
274
275 static int on_serverip(const char *name, const char *value, enum env_op op,
276         int flags)
277 {
278         if (flags & H_PROGRAMMATIC)
279                 return 0;
280
281         net_server_ip = string_to_ip(value);
282
283         return 0;
284 }
285 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
286
287 static int on_nvlan(const char *name, const char *value, enum env_op op,
288         int flags)
289 {
290         if (flags & H_PROGRAMMATIC)
291                 return 0;
292
293         net_native_vlan = string_to_vlan(value);
294
295         return 0;
296 }
297 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
298
299 static int on_vlan(const char *name, const char *value, enum env_op op,
300         int flags)
301 {
302         if (flags & H_PROGRAMMATIC)
303                 return 0;
304
305         net_our_vlan = string_to_vlan(value);
306
307         return 0;
308 }
309 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
310
311 #if defined(CONFIG_CMD_DNS)
312 static int on_dnsip(const char *name, const char *value, enum env_op op,
313         int flags)
314 {
315         if (flags & H_PROGRAMMATIC)
316                 return 0;
317
318         net_dns_server = string_to_ip(value);
319
320         return 0;
321 }
322 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
323 #endif
324
325 /*
326  * Check if autoload is enabled. If so, use either NFS or TFTP to download
327  * the boot file.
328  */
329 void net_auto_load(void)
330 {
331 #if defined(CONFIG_CMD_NFS)
332         const char *s = env_get("autoload");
333
334         if (s != NULL && strcmp(s, "NFS") == 0) {
335                 if (net_check_prereq(NFS)) {
336 /* We aren't expecting to get a serverip, so just accept the assigned IP */
337 #ifdef CONFIG_BOOTP_SERVERIP
338                         net_set_state(NETLOOP_SUCCESS);
339 #else
340                         printf("Cannot autoload with NFS\n");
341                         net_set_state(NETLOOP_FAIL);
342 #endif
343                         return;
344                 }
345                 /*
346                  * Use NFS to load the bootfile.
347                  */
348                 nfs_start();
349                 return;
350         }
351 #endif
352         if (env_get_yesno("autoload") == 0) {
353                 /*
354                  * Just use BOOTP/RARP to configure system;
355                  * Do not use TFTP to load the bootfile.
356                  */
357                 net_set_state(NETLOOP_SUCCESS);
358                 return;
359         }
360         if (net_check_prereq(TFTPGET)) {
361 /* We aren't expecting to get a serverip, so just accept the assigned IP */
362 #ifdef CONFIG_BOOTP_SERVERIP
363                 net_set_state(NETLOOP_SUCCESS);
364 #else
365                 printf("Cannot autoload with TFTPGET\n");
366                 net_set_state(NETLOOP_FAIL);
367 #endif
368                 return;
369         }
370         tftp_start(TFTPGET);
371 }
372
373 static void net_init_loop(void)
374 {
375         if (eth_get_dev())
376                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
377
378         return;
379 }
380
381 static void net_clear_handlers(void)
382 {
383         net_set_udp_handler(NULL);
384         net_set_arp_handler(NULL);
385         net_set_timeout_handler(0, NULL);
386 }
387
388 static void net_cleanup_loop(void)
389 {
390         net_clear_handlers();
391 }
392
393 void net_init(void)
394 {
395         static int first_call = 1;
396
397         if (first_call) {
398                 /*
399                  *      Setup packet buffers, aligned correctly.
400                  */
401                 int i;
402
403                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
404                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
405                 for (i = 0; i < PKTBUFSRX; i++) {
406                         net_rx_packets[i] = net_tx_packet +
407                                 (i + 1) * PKTSIZE_ALIGN;
408                 }
409                 arp_init();
410                 net_clear_handlers();
411
412                 /* Only need to setup buffer pointers once. */
413                 first_call = 0;
414         }
415
416         net_init_loop();
417 }
418
419 /**********************************************************************/
420 /*
421  *      Main network processing loop.
422  */
423
424 int net_loop(enum proto_t protocol)
425 {
426         int ret = -EINVAL;
427         enum net_loop_state prev_net_state = net_state;
428
429         net_restarted = 0;
430         net_dev_exists = 0;
431         net_try_count = 1;
432         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
433
434         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
435         net_init();
436         if (eth_is_on_demand_init() || protocol != NETCONS) {
437                 eth_halt();
438                 eth_set_current();
439                 ret = eth_init();
440                 if (ret < 0) {
441                         eth_halt();
442                         return ret;
443                 }
444         } else {
445                 eth_init_state_only();
446         }
447 restart:
448 #ifdef CONFIG_USB_KEYBOARD
449         net_busy_flag = 0;
450 #endif
451         net_set_state(NETLOOP_CONTINUE);
452
453         /*
454          *      Start the ball rolling with the given start function.  From
455          *      here on, this code is a state machine driven by received
456          *      packets and timer events.
457          */
458         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
459         net_init_loop();
460
461         switch (net_check_prereq(protocol)) {
462         case 1:
463                 /* network not configured */
464                 eth_halt();
465                 net_set_state(prev_net_state);
466                 return -ENODEV;
467
468         case 2:
469                 /* network device not configured */
470                 break;
471
472         case 0:
473                 net_dev_exists = 1;
474                 net_boot_file_size = 0;
475                 switch (protocol) {
476                 case TFTPGET:
477 #ifdef CONFIG_CMD_TFTPPUT
478                 case TFTPPUT:
479 #endif
480                         /* always use ARP to get server ethernet address */
481                         tftp_start(protocol);
482                         break;
483 #ifdef CONFIG_CMD_TFTPSRV
484                 case TFTPSRV:
485                         tftp_start_server();
486                         break;
487 #endif
488 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
489                 case FASTBOOT:
490                         fastboot_start_server();
491                         break;
492 #endif
493 #if defined(CONFIG_CMD_DHCP)
494                 case DHCP:
495                         bootp_reset();
496                         net_ip.s_addr = 0;
497                         dhcp_request();         /* Basically same as BOOTP */
498                         break;
499 #endif
500
501                 case BOOTP:
502                         bootp_reset();
503                         net_ip.s_addr = 0;
504                         bootp_request();
505                         break;
506
507 #if defined(CONFIG_CMD_RARP)
508                 case RARP:
509                         rarp_try = 0;
510                         net_ip.s_addr = 0;
511                         rarp_request();
512                         break;
513 #endif
514 #if defined(CONFIG_CMD_PING)
515                 case PING:
516                         ping_start();
517                         break;
518 #endif
519 #if defined(CONFIG_CMD_NFS)
520                 case NFS:
521                         nfs_start();
522                         break;
523 #endif
524 #if defined(CONFIG_CMD_CDP)
525                 case CDP:
526                         cdp_start();
527                         break;
528 #endif
529 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
530                 case NETCONS:
531                         nc_start();
532                         break;
533 #endif
534 #if defined(CONFIG_CMD_SNTP)
535                 case SNTP:
536                         sntp_start();
537                         break;
538 #endif
539 #if defined(CONFIG_CMD_DNS)
540                 case DNS:
541                         dns_start();
542                         break;
543 #endif
544 #if defined(CONFIG_CMD_LINK_LOCAL)
545                 case LINKLOCAL:
546                         link_local_start();
547                         break;
548 #endif
549 #if defined(CONFIG_CMD_WOL)
550                 case WOL:
551                         wol_start();
552                         break;
553 #endif
554                 default:
555                         break;
556                 }
557
558                 break;
559         }
560
561 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
562 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
563         defined(CONFIG_LED_STATUS)                      && \
564         defined(CONFIG_LED_STATUS_RED)
565         /*
566          * Echo the inverted link state to the fault LED.
567          */
568         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
569                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
570         else
571                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
572 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
573 #endif /* CONFIG_MII, ... */
574 #ifdef CONFIG_USB_KEYBOARD
575         net_busy_flag = 1;
576 #endif
577
578         /*
579          *      Main packet reception loop.  Loop receiving packets until
580          *      someone sets `net_state' to a state that terminates.
581          */
582         for (;;) {
583                 WATCHDOG_RESET();
584 #ifdef CONFIG_SHOW_ACTIVITY
585                 show_activity(1);
586 #endif
587                 if (arp_timeout_check() > 0)
588                         time_start = get_timer(0);
589
590                 /*
591                  *      Check the ethernet for a new packet.  The ethernet
592                  *      receive routine will process it.
593                  *      Most drivers return the most recent packet size, but not
594                  *      errors that may have happened.
595                  */
596                 eth_rx();
597
598                 /*
599                  *      Abort if ctrl-c was pressed.
600                  */
601                 if (ctrlc()) {
602                         /* cancel any ARP that may not have completed */
603                         net_arp_wait_packet_ip.s_addr = 0;
604
605                         net_cleanup_loop();
606                         eth_halt();
607                         /* Invalidate the last protocol */
608                         eth_set_last_protocol(BOOTP);
609
610                         puts("\nAbort\n");
611                         /* include a debug print as well incase the debug
612                            messages are directed to stderr */
613                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
614                         ret = -EINTR;
615                         goto done;
616                 }
617
618                 /*
619                  *      Check for a timeout, and run the timeout handler
620                  *      if we have one.
621                  */
622                 if (time_handler &&
623                     ((get_timer(0) - time_start) > time_delta)) {
624                         thand_f *x;
625
626 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
627 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
628         defined(CONFIG_LED_STATUS)                      && \
629         defined(CONFIG_LED_STATUS_RED)
630                         /*
631                          * Echo the inverted link state to the fault LED.
632                          */
633                         if (miiphy_link(eth_get_dev()->name,
634                                         CONFIG_SYS_FAULT_MII_ADDR))
635                                 status_led_set(CONFIG_LED_STATUS_RED,
636                                                CONFIG_LED_STATUS_OFF);
637                         else
638                                 status_led_set(CONFIG_LED_STATUS_RED,
639                                                CONFIG_LED_STATUS_ON);
640 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
641 #endif /* CONFIG_MII, ... */
642                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
643                         x = time_handler;
644                         time_handler = (thand_f *)0;
645                         (*x)();
646                 }
647
648                 if (net_state == NETLOOP_FAIL)
649                         ret = net_start_again();
650
651                 switch (net_state) {
652                 case NETLOOP_RESTART:
653                         net_restarted = 1;
654                         goto restart;
655
656                 case NETLOOP_SUCCESS:
657                         net_cleanup_loop();
658                         if (net_boot_file_size > 0) {
659                                 printf("Bytes transferred = %d (%x hex)\n",
660                                        net_boot_file_size, net_boot_file_size);
661                                 env_set_hex("filesize", net_boot_file_size);
662                                 env_set_hex("fileaddr", load_addr);
663                         }
664                         if (protocol != NETCONS)
665                                 eth_halt();
666                         else
667                                 eth_halt_state_only();
668
669                         eth_set_last_protocol(protocol);
670
671                         ret = net_boot_file_size;
672                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
673                         goto done;
674
675                 case NETLOOP_FAIL:
676                         net_cleanup_loop();
677                         /* Invalidate the last protocol */
678                         eth_set_last_protocol(BOOTP);
679                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
680                         goto done;
681
682                 case NETLOOP_CONTINUE:
683                         continue;
684                 }
685         }
686
687 done:
688 #ifdef CONFIG_USB_KEYBOARD
689         net_busy_flag = 0;
690 #endif
691 #ifdef CONFIG_CMD_TFTPPUT
692         /* Clear out the handlers */
693         net_set_udp_handler(NULL);
694         net_set_icmp_handler(NULL);
695 #endif
696         net_set_state(prev_net_state);
697         return ret;
698 }
699
700 /**********************************************************************/
701
702 static void start_again_timeout_handler(void)
703 {
704         net_set_state(NETLOOP_RESTART);
705 }
706
707 int net_start_again(void)
708 {
709         char *nretry;
710         int retry_forever = 0;
711         unsigned long retrycnt = 0;
712         int ret;
713
714         nretry = env_get("netretry");
715         if (nretry) {
716                 if (!strcmp(nretry, "yes"))
717                         retry_forever = 1;
718                 else if (!strcmp(nretry, "no"))
719                         retrycnt = 0;
720                 else if (!strcmp(nretry, "once"))
721                         retrycnt = 1;
722                 else
723                         retrycnt = simple_strtoul(nretry, NULL, 0);
724         } else {
725                 retrycnt = 0;
726                 retry_forever = 0;
727         }
728
729         if ((!retry_forever) && (net_try_count > retrycnt)) {
730                 eth_halt();
731                 net_set_state(NETLOOP_FAIL);
732                 /*
733                  * We don't provide a way for the protocol to return an error,
734                  * but this is almost always the reason.
735                  */
736                 return -ETIMEDOUT;
737         }
738
739         net_try_count++;
740
741         eth_halt();
742 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
743         eth_try_another(!net_restarted);
744 #endif
745         ret = eth_init();
746         if (net_restart_wrap) {
747                 net_restart_wrap = 0;
748                 if (net_dev_exists) {
749                         net_set_timeout_handler(10000UL,
750                                                 start_again_timeout_handler);
751                         net_set_udp_handler(NULL);
752                 } else {
753                         net_set_state(NETLOOP_FAIL);
754                 }
755         } else {
756                 net_set_state(NETLOOP_RESTART);
757         }
758         return ret;
759 }
760
761 /**********************************************************************/
762 /*
763  *      Miscelaneous bits.
764  */
765
766 static void dummy_handler(uchar *pkt, unsigned dport,
767                         struct in_addr sip, unsigned sport,
768                         unsigned len)
769 {
770 }
771
772 rxhand_f *net_get_udp_handler(void)
773 {
774         return udp_packet_handler;
775 }
776
777 void net_set_udp_handler(rxhand_f *f)
778 {
779         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
780         if (f == NULL)
781                 udp_packet_handler = dummy_handler;
782         else
783                 udp_packet_handler = f;
784 }
785
786 rxhand_f *net_get_arp_handler(void)
787 {
788         return arp_packet_handler;
789 }
790
791 void net_set_arp_handler(rxhand_f *f)
792 {
793         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
794         if (f == NULL)
795                 arp_packet_handler = dummy_handler;
796         else
797                 arp_packet_handler = f;
798 }
799
800 #ifdef CONFIG_CMD_TFTPPUT
801 void net_set_icmp_handler(rxhand_icmp_f *f)
802 {
803         packet_icmp_handler = f;
804 }
805 #endif
806
807 void net_set_timeout_handler(ulong iv, thand_f *f)
808 {
809         if (iv == 0) {
810                 debug_cond(DEBUG_INT_STATE,
811                            "--- net_loop timeout handler cancelled\n");
812                 time_handler = (thand_f *)0;
813         } else {
814                 debug_cond(DEBUG_INT_STATE,
815                            "--- net_loop timeout handler set (%p)\n", f);
816                 time_handler = f;
817                 time_start = get_timer(0);
818                 time_delta = iv * CONFIG_SYS_HZ / 1000;
819         }
820 }
821
822 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
823                 int payload_len)
824 {
825         uchar *pkt;
826         int eth_hdr_size;
827         int pkt_hdr_size;
828
829         /* make sure the net_tx_packet is initialized (net_init() was called) */
830         assert(net_tx_packet != NULL);
831         if (net_tx_packet == NULL)
832                 return -1;
833
834         /* convert to new style broadcast */
835         if (dest.s_addr == 0)
836                 dest.s_addr = 0xFFFFFFFF;
837
838         /* if broadcast, make the ether address a broadcast and don't do ARP */
839         if (dest.s_addr == 0xFFFFFFFF)
840                 ether = (uchar *)net_bcast_ethaddr;
841
842         pkt = (uchar *)net_tx_packet;
843
844         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
845         pkt += eth_hdr_size;
846         net_set_udp_header(pkt, dest, dport, sport, payload_len);
847         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
848
849         /* if MAC address was not discovered yet, do an ARP request */
850         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
851                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
852
853                 /* save the ip and eth addr for the packet to send after arp */
854                 net_arp_wait_packet_ip = dest;
855                 arp_wait_packet_ethaddr = ether;
856
857                 /* size of the waiting packet */
858                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
859
860                 /* and do the ARP request */
861                 arp_wait_try = 1;
862                 arp_wait_timer_start = get_timer(0);
863                 arp_request();
864                 return 1;       /* waiting */
865         } else {
866                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
867                            &dest, ether);
868                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
869                 return 0;       /* transmitted */
870         }
871 }
872
873 #ifdef CONFIG_IP_DEFRAG
874 /*
875  * This function collects fragments in a single packet, according
876  * to the algorithm in RFC815. It returns NULL or the pointer to
877  * a complete packet, in static storage
878  */
879 #ifndef CONFIG_NET_MAXDEFRAG
880 #define CONFIG_NET_MAXDEFRAG 16384
881 #endif
882 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
883
884 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
885
886 /*
887  * this is the packet being assembled, either data or frag control.
888  * Fragments go by 8 bytes, so this union must be 8 bytes long
889  */
890 struct hole {
891         /* first_byte is address of this structure */
892         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
893         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
894         u16 prev_hole;  /* index of prev, 0 == none */
895         u16 unused;
896 };
897
898 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
899 {
900         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
901         static u16 first_hole, total_len;
902         struct hole *payload, *thisfrag, *h, *newh;
903         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
904         uchar *indata = (uchar *)ip;
905         int offset8, start, len, done = 0;
906         u16 ip_off = ntohs(ip->ip_off);
907
908         /* payload starts after IP header, this fragment is in there */
909         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
910         offset8 =  (ip_off & IP_OFFS);
911         thisfrag = payload + offset8;
912         start = offset8 * 8;
913         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
914
915         if (start + len > IP_MAXUDP) /* fragment extends too far */
916                 return NULL;
917
918         if (!total_len || localip->ip_id != ip->ip_id) {
919                 /* new (or different) packet, reset structs */
920                 total_len = 0xffff;
921                 payload[0].last_byte = ~0;
922                 payload[0].next_hole = 0;
923                 payload[0].prev_hole = 0;
924                 first_hole = 0;
925                 /* any IP header will work, copy the first we received */
926                 memcpy(localip, ip, IP_HDR_SIZE);
927         }
928
929         /*
930          * What follows is the reassembly algorithm. We use the payload
931          * array as a linked list of hole descriptors, as each hole starts
932          * at a multiple of 8 bytes. However, last byte can be whatever value,
933          * so it is represented as byte count, not as 8-byte blocks.
934          */
935
936         h = payload + first_hole;
937         while (h->last_byte < start) {
938                 if (!h->next_hole) {
939                         /* no hole that far away */
940                         return NULL;
941                 }
942                 h = payload + h->next_hole;
943         }
944
945         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
946         if (offset8 + ((len + 7) / 8) <= h - payload) {
947                 /* no overlap with holes (dup fragment?) */
948                 return NULL;
949         }
950
951         if (!(ip_off & IP_FLAGS_MFRAG)) {
952                 /* no more fragmentss: truncate this (last) hole */
953                 total_len = start + len;
954                 h->last_byte = start + len;
955         }
956
957         /*
958          * There is some overlap: fix the hole list. This code doesn't
959          * deal with a fragment that overlaps with two different holes
960          * (thus being a superset of a previously-received fragment).
961          */
962
963         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
964                 /* complete overlap with hole: remove hole */
965                 if (!h->prev_hole && !h->next_hole) {
966                         /* last remaining hole */
967                         done = 1;
968                 } else if (!h->prev_hole) {
969                         /* first hole */
970                         first_hole = h->next_hole;
971                         payload[h->next_hole].prev_hole = 0;
972                 } else if (!h->next_hole) {
973                         /* last hole */
974                         payload[h->prev_hole].next_hole = 0;
975                 } else {
976                         /* in the middle of the list */
977                         payload[h->next_hole].prev_hole = h->prev_hole;
978                         payload[h->prev_hole].next_hole = h->next_hole;
979                 }
980
981         } else if (h->last_byte <= start + len) {
982                 /* overlaps with final part of the hole: shorten this hole */
983                 h->last_byte = start;
984
985         } else if (h >= thisfrag) {
986                 /* overlaps with initial part of the hole: move this hole */
987                 newh = thisfrag + (len / 8);
988                 *newh = *h;
989                 h = newh;
990                 if (h->next_hole)
991                         payload[h->next_hole].prev_hole = (h - payload);
992                 if (h->prev_hole)
993                         payload[h->prev_hole].next_hole = (h - payload);
994                 else
995                         first_hole = (h - payload);
996
997         } else {
998                 /* fragment sits in the middle: split the hole */
999                 newh = thisfrag + (len / 8);
1000                 *newh = *h;
1001                 h->last_byte = start;
1002                 h->next_hole = (newh - payload);
1003                 newh->prev_hole = (h - payload);
1004                 if (newh->next_hole)
1005                         payload[newh->next_hole].prev_hole = (newh - payload);
1006         }
1007
1008         /* finally copy this fragment and possibly return whole packet */
1009         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1010         if (!done)
1011                 return NULL;
1012
1013         localip->ip_len = htons(total_len);
1014         *lenp = total_len + IP_HDR_SIZE;
1015         return localip;
1016 }
1017
1018 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1019         int *lenp)
1020 {
1021         u16 ip_off = ntohs(ip->ip_off);
1022         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1023                 return ip; /* not a fragment */
1024         return __net_defragment(ip, lenp);
1025 }
1026
1027 #else /* !CONFIG_IP_DEFRAG */
1028
1029 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1030         int *lenp)
1031 {
1032         u16 ip_off = ntohs(ip->ip_off);
1033         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1034                 return ip; /* not a fragment */
1035         return NULL;
1036 }
1037 #endif
1038
1039 /**
1040  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1041  * drop others.
1042  *
1043  * @parma ip    IP packet containing the ICMP
1044  */
1045 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1046                         struct in_addr src_ip, struct ethernet_hdr *et)
1047 {
1048         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1049
1050         switch (icmph->type) {
1051         case ICMP_REDIRECT:
1052                 if (icmph->code != ICMP_REDIR_HOST)
1053                         return;
1054                 printf(" ICMP Host Redirect to %pI4 ",
1055                        &icmph->un.gateway);
1056                 break;
1057         default:
1058 #if defined(CONFIG_CMD_PING)
1059                 ping_receive(et, ip, len);
1060 #endif
1061 #ifdef CONFIG_CMD_TFTPPUT
1062                 if (packet_icmp_handler)
1063                         packet_icmp_handler(icmph->type, icmph->code,
1064                                             ntohs(ip->udp_dst), src_ip,
1065                                             ntohs(ip->udp_src), icmph->un.data,
1066                                             ntohs(ip->udp_len));
1067 #endif
1068                 break;
1069         }
1070 }
1071
1072 void net_process_received_packet(uchar *in_packet, int len)
1073 {
1074         struct ethernet_hdr *et;
1075         struct ip_udp_hdr *ip;
1076         struct in_addr dst_ip;
1077         struct in_addr src_ip;
1078         int eth_proto;
1079 #if defined(CONFIG_CMD_CDP)
1080         int iscdp;
1081 #endif
1082         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1083
1084         debug_cond(DEBUG_NET_PKT, "packet received\n");
1085
1086         net_rx_packet = in_packet;
1087         net_rx_packet_len = len;
1088         et = (struct ethernet_hdr *)in_packet;
1089
1090         /* too small packet? */
1091         if (len < ETHER_HDR_SIZE)
1092                 return;
1093
1094 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1095         if (push_packet) {
1096                 (*push_packet)(in_packet, len);
1097                 return;
1098         }
1099 #endif
1100
1101 #if defined(CONFIG_CMD_CDP)
1102         /* keep track if packet is CDP */
1103         iscdp = is_cdp_packet(et->et_dest);
1104 #endif
1105
1106         myvlanid = ntohs(net_our_vlan);
1107         if (myvlanid == (ushort)-1)
1108                 myvlanid = VLAN_NONE;
1109         mynvlanid = ntohs(net_native_vlan);
1110         if (mynvlanid == (ushort)-1)
1111                 mynvlanid = VLAN_NONE;
1112
1113         eth_proto = ntohs(et->et_protlen);
1114
1115         if (eth_proto < 1514) {
1116                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1117                 /*
1118                  *      Got a 802.2 packet.  Check the other protocol field.
1119                  *      XXX VLAN over 802.2+SNAP not implemented!
1120                  */
1121                 eth_proto = ntohs(et802->et_prot);
1122
1123                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1124                 len -= E802_HDR_SIZE;
1125
1126         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1127                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1128                 len -= ETHER_HDR_SIZE;
1129
1130         } else {                        /* VLAN packet */
1131                 struct vlan_ethernet_hdr *vet =
1132                         (struct vlan_ethernet_hdr *)et;
1133
1134                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1135
1136                 /* too small packet? */
1137                 if (len < VLAN_ETHER_HDR_SIZE)
1138                         return;
1139
1140                 /* if no VLAN active */
1141                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1142 #if defined(CONFIG_CMD_CDP)
1143                                 && iscdp == 0
1144 #endif
1145                                 )
1146                         return;
1147
1148                 cti = ntohs(vet->vet_tag);
1149                 vlanid = cti & VLAN_IDMASK;
1150                 eth_proto = ntohs(vet->vet_type);
1151
1152                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1153                 len -= VLAN_ETHER_HDR_SIZE;
1154         }
1155
1156         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1157
1158 #if defined(CONFIG_CMD_CDP)
1159         if (iscdp) {
1160                 cdp_receive((uchar *)ip, len);
1161                 return;
1162         }
1163 #endif
1164
1165         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1166                 if (vlanid == VLAN_NONE)
1167                         vlanid = (mynvlanid & VLAN_IDMASK);
1168                 /* not matched? */
1169                 if (vlanid != (myvlanid & VLAN_IDMASK))
1170                         return;
1171         }
1172
1173         switch (eth_proto) {
1174         case PROT_ARP:
1175                 arp_receive(et, ip, len);
1176                 break;
1177
1178 #ifdef CONFIG_CMD_RARP
1179         case PROT_RARP:
1180                 rarp_receive(ip, len);
1181                 break;
1182 #endif
1183         case PROT_IP:
1184                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1185                 /* Before we start poking the header, make sure it is there */
1186                 if (len < IP_UDP_HDR_SIZE) {
1187                         debug("len bad %d < %lu\n", len,
1188                               (ulong)IP_UDP_HDR_SIZE);
1189                         return;
1190                 }
1191                 /* Check the packet length */
1192                 if (len < ntohs(ip->ip_len)) {
1193                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1194                         return;
1195                 }
1196                 len = ntohs(ip->ip_len);
1197                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1198                            len, ip->ip_hl_v & 0xff);
1199
1200                 /* Can't deal with anything except IPv4 */
1201                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1202                         return;
1203                 /* Can't deal with IP options (headers != 20 bytes) */
1204                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1205                         return;
1206                 /* Check the Checksum of the header */
1207                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1208                         debug("checksum bad\n");
1209                         return;
1210                 }
1211                 /* If it is not for us, ignore it */
1212                 dst_ip = net_read_ip(&ip->ip_dst);
1213                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1214                     dst_ip.s_addr != 0xFFFFFFFF) {
1215 #ifdef CONFIG_MCAST_TFTP
1216                         if (net_mcast_addr != dst_ip)
1217 #endif
1218                                 return;
1219                 }
1220                 /* Read source IP address for later use */
1221                 src_ip = net_read_ip(&ip->ip_src);
1222                 /*
1223                  * The function returns the unchanged packet if it's not
1224                  * a fragment, and either the complete packet or NULL if
1225                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1226                  */
1227                 ip = net_defragment(ip, &len);
1228                 if (!ip)
1229                         return;
1230                 /*
1231                  * watch for ICMP host redirects
1232                  *
1233                  * There is no real handler code (yet). We just watch
1234                  * for ICMP host redirect messages. In case anybody
1235                  * sees these messages: please contact me
1236                  * (wd@denx.de), or - even better - send me the
1237                  * necessary fixes :-)
1238                  *
1239                  * Note: in all cases where I have seen this so far
1240                  * it was a problem with the router configuration,
1241                  * for instance when a router was configured in the
1242                  * BOOTP reply, but the TFTP server was on the same
1243                  * subnet. So this is probably a warning that your
1244                  * configuration might be wrong. But I'm not really
1245                  * sure if there aren't any other situations.
1246                  *
1247                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1248                  * we send a tftp packet to a dead connection, or when
1249                  * there is no server at the other end.
1250                  */
1251                 if (ip->ip_p == IPPROTO_ICMP) {
1252                         receive_icmp(ip, len, src_ip, et);
1253                         return;
1254                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1255                         return;
1256                 }
1257
1258                 debug_cond(DEBUG_DEV_PKT,
1259                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1260                            &dst_ip, &src_ip, len);
1261
1262 #ifdef CONFIG_UDP_CHECKSUM
1263                 if (ip->udp_xsum != 0) {
1264                         ulong   xsum;
1265                         ushort *sumptr;
1266                         ushort  sumlen;
1267
1268                         xsum  = ip->ip_p;
1269                         xsum += (ntohs(ip->udp_len));
1270                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1271                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1272                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1273                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1274
1275                         sumlen = ntohs(ip->udp_len);
1276                         sumptr = (ushort *)&(ip->udp_src);
1277
1278                         while (sumlen > 1) {
1279                                 ushort sumdata;
1280
1281                                 sumdata = *sumptr++;
1282                                 xsum += ntohs(sumdata);
1283                                 sumlen -= 2;
1284                         }
1285                         if (sumlen > 0) {
1286                                 ushort sumdata;
1287
1288                                 sumdata = *(unsigned char *)sumptr;
1289                                 sumdata = (sumdata << 8) & 0xff00;
1290                                 xsum += sumdata;
1291                         }
1292                         while ((xsum >> 16) != 0) {
1293                                 xsum = (xsum & 0x0000ffff) +
1294                                        ((xsum >> 16) & 0x0000ffff);
1295                         }
1296                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1297                                 printf(" UDP wrong checksum %08lx %08x\n",
1298                                        xsum, ntohs(ip->udp_xsum));
1299                                 return;
1300                         }
1301                 }
1302 #endif
1303
1304 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1305                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1306                                 src_ip,
1307                                 ntohs(ip->udp_dst),
1308                                 ntohs(ip->udp_src),
1309                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1310 #endif
1311                 /*
1312                  * IP header OK.  Pass the packet to the current handler.
1313                  */
1314                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1315                                       ntohs(ip->udp_dst),
1316                                       src_ip,
1317                                       ntohs(ip->udp_src),
1318                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1319                 break;
1320 #ifdef CONFIG_CMD_WOL
1321         case PROT_WOL:
1322                 wol_receive(ip, len);
1323                 break;
1324 #endif
1325         }
1326 }
1327
1328 /**********************************************************************/
1329
1330 static int net_check_prereq(enum proto_t protocol)
1331 {
1332         switch (protocol) {
1333                 /* Fall through */
1334 #if defined(CONFIG_CMD_PING)
1335         case PING:
1336                 if (net_ping_ip.s_addr == 0) {
1337                         puts("*** ERROR: ping address not given\n");
1338                         return 1;
1339                 }
1340                 goto common;
1341 #endif
1342 #if defined(CONFIG_CMD_SNTP)
1343         case SNTP:
1344                 if (net_ntp_server.s_addr == 0) {
1345                         puts("*** ERROR: NTP server address not given\n");
1346                         return 1;
1347                 }
1348                 goto common;
1349 #endif
1350 #if defined(CONFIG_CMD_DNS)
1351         case DNS:
1352                 if (net_dns_server.s_addr == 0) {
1353                         puts("*** ERROR: DNS server address not given\n");
1354                         return 1;
1355                 }
1356                 goto common;
1357 #endif
1358 #if defined(CONFIG_CMD_NFS)
1359         case NFS:
1360 #endif
1361                 /* Fall through */
1362         case TFTPGET:
1363         case TFTPPUT:
1364                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1365                         puts("*** ERROR: `serverip' not set\n");
1366                         return 1;
1367                 }
1368 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1369         defined(CONFIG_CMD_DNS)
1370 common:
1371 #endif
1372                 /* Fall through */
1373
1374         case NETCONS:
1375         case FASTBOOT:
1376         case TFTPSRV:
1377                 if (net_ip.s_addr == 0) {
1378                         puts("*** ERROR: `ipaddr' not set\n");
1379                         return 1;
1380                 }
1381                 /* Fall through */
1382
1383 #ifdef CONFIG_CMD_RARP
1384         case RARP:
1385 #endif
1386         case BOOTP:
1387         case CDP:
1388         case DHCP:
1389         case LINKLOCAL:
1390                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1391                         int num = eth_get_dev_index();
1392
1393                         switch (num) {
1394                         case -1:
1395                                 puts("*** ERROR: No ethernet found.\n");
1396                                 return 1;
1397                         case 0:
1398                                 puts("*** ERROR: `ethaddr' not set\n");
1399                                 break;
1400                         default:
1401                                 printf("*** ERROR: `eth%daddr' not set\n",
1402                                        num);
1403                                 break;
1404                         }
1405
1406                         net_start_again();
1407                         return 2;
1408                 }
1409                 /* Fall through */
1410         default:
1411                 return 0;
1412         }
1413         return 0;               /* OK */
1414 }
1415 /**********************************************************************/
1416
1417 int
1418 net_eth_hdr_size(void)
1419 {
1420         ushort myvlanid;
1421
1422         myvlanid = ntohs(net_our_vlan);
1423         if (myvlanid == (ushort)-1)
1424                 myvlanid = VLAN_NONE;
1425
1426         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1427                 VLAN_ETHER_HDR_SIZE;
1428 }
1429
1430 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1431 {
1432         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1433         ushort myvlanid;
1434
1435         myvlanid = ntohs(net_our_vlan);
1436         if (myvlanid == (ushort)-1)
1437                 myvlanid = VLAN_NONE;
1438
1439         memcpy(et->et_dest, dest_ethaddr, 6);
1440         memcpy(et->et_src, net_ethaddr, 6);
1441         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1442                 et->et_protlen = htons(prot);
1443                 return ETHER_HDR_SIZE;
1444         } else {
1445                 struct vlan_ethernet_hdr *vet =
1446                         (struct vlan_ethernet_hdr *)xet;
1447
1448                 vet->vet_vlan_type = htons(PROT_VLAN);
1449                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1450                 vet->vet_type = htons(prot);
1451                 return VLAN_ETHER_HDR_SIZE;
1452         }
1453 }
1454
1455 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1456 {
1457         ushort protlen;
1458
1459         memcpy(et->et_dest, addr, 6);
1460         memcpy(et->et_src, net_ethaddr, 6);
1461         protlen = ntohs(et->et_protlen);
1462         if (protlen == PROT_VLAN) {
1463                 struct vlan_ethernet_hdr *vet =
1464                         (struct vlan_ethernet_hdr *)et;
1465                 vet->vet_type = htons(prot);
1466                 return VLAN_ETHER_HDR_SIZE;
1467         } else if (protlen > 1514) {
1468                 et->et_protlen = htons(prot);
1469                 return ETHER_HDR_SIZE;
1470         } else {
1471                 /* 802.2 + SNAP */
1472                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1473                 et802->et_prot = htons(prot);
1474                 return E802_HDR_SIZE;
1475         }
1476 }
1477
1478 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1479 {
1480         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1481
1482         /*
1483          *      Construct an IP header.
1484          */
1485         /* IP_HDR_SIZE / 4 (not including UDP) */
1486         ip->ip_hl_v  = 0x45;
1487         ip->ip_tos   = 0;
1488         ip->ip_len   = htons(IP_HDR_SIZE);
1489         ip->ip_id    = htons(net_ip_id++);
1490         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1491         ip->ip_ttl   = 255;
1492         ip->ip_sum   = 0;
1493         /* already in network byte order */
1494         net_copy_ip((void *)&ip->ip_src, &source);
1495         /* already in network byte order */
1496         net_copy_ip((void *)&ip->ip_dst, &dest);
1497 }
1498
1499 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1500                         int len)
1501 {
1502         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1503
1504         /*
1505          *      If the data is an odd number of bytes, zero the
1506          *      byte after the last byte so that the checksum
1507          *      will work.
1508          */
1509         if (len & 1)
1510                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1511
1512         net_set_ip_header(pkt, dest, net_ip);
1513         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1514         ip->ip_p     = IPPROTO_UDP;
1515         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1516
1517         ip->udp_src  = htons(sport);
1518         ip->udp_dst  = htons(dport);
1519         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1520         ip->udp_xsum = 0;
1521 }
1522
1523 void copy_filename(char *dst, const char *src, int size)
1524 {
1525         if (src && *src && (*src == '"')) {
1526                 ++src;
1527                 --size;
1528         }
1529
1530         while ((--size > 0) && src && *src && (*src != '"'))
1531                 *dst++ = *src++;
1532         *dst = '\0';
1533 }
1534
1535 int is_serverip_in_cmd(void)
1536 {
1537         return !!strchr(net_boot_file_name, ':');
1538 }
1539
1540 #if     defined(CONFIG_CMD_NFS)         || \
1541         defined(CONFIG_CMD_SNTP)        || \
1542         defined(CONFIG_CMD_DNS)
1543 /*
1544  * make port a little random (1024-17407)
1545  * This keeps the math somewhat trivial to compute, and seems to work with
1546  * all supported protocols/clients/servers
1547  */
1548 unsigned int random_port(void)
1549 {
1550         return 1024 + (get_timer(0) % 0x4000);
1551 }
1552 #endif
1553
1554 void ip_to_string(struct in_addr x, char *s)
1555 {
1556         x.s_addr = ntohl(x.s_addr);
1557         sprintf(s, "%d.%d.%d.%d",
1558                 (int) ((x.s_addr >> 24) & 0xff),
1559                 (int) ((x.s_addr >> 16) & 0xff),
1560                 (int) ((x.s_addr >> 8) & 0xff),
1561                 (int) ((x.s_addr >> 0) & 0xff)
1562         );
1563 }
1564
1565 void vlan_to_string(ushort x, char *s)
1566 {
1567         x = ntohs(x);
1568
1569         if (x == (ushort)-1)
1570                 x = VLAN_NONE;
1571
1572         if (x == VLAN_NONE)
1573                 strcpy(s, "none");
1574         else
1575                 sprintf(s, "%d", x & VLAN_IDMASK);
1576 }
1577
1578 ushort string_to_vlan(const char *s)
1579 {
1580         ushort id;
1581
1582         if (s == NULL)
1583                 return htons(VLAN_NONE);
1584
1585         if (*s < '0' || *s > '9')
1586                 id = VLAN_NONE;
1587         else
1588                 id = (ushort)simple_strtoul(s, NULL, 10);
1589
1590         return htons(id);
1591 }
1592
1593 ushort env_get_vlan(char *var)
1594 {
1595         return string_to_vlan(env_get(var));
1596 }