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