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