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Merge branch 'master' of git://git.denx.de/u-boot-mmc
[people/ms/u-boot.git] / net / net.c
1 /*
2 * Copied from Linux Monitor (LiMon) - Networking.
3 *
4 * Copyright 1994 - 2000 Neil Russell.
5 * (See License)
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9 * SPDX-License-Identifier: GPL-2.0
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 <environment.h>
87 #include <errno.h>
88 #include <net.h>
89 #if defined(CONFIG_STATUS_LED)
90 #include <miiphy.h>
91 #include <status_led.h>
92 #endif
93 #include <watchdog.h>
94 #include <linux/compiler.h>
95 #include "arp.h"
96 #include "bootp.h"
97 #include "cdp.h"
98 #if defined(CONFIG_CMD_DNS)
99 #include "dns.h"
100 #endif
101 #include "link_local.h"
102 #include "nfs.h"
103 #include "ping.h"
104 #include "rarp.h"
105 #if defined(CONFIG_CMD_SNTP)
106 #include "sntp.h"
107 #endif
108 #include "tftp.h"
109
110 DECLARE_GLOBAL_DATA_PTR;
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 #ifdef CONFIG_API
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[128];
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 = getenv("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 (getenv_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 #if defined(CONFIG_CMD_DHCP)
456 case DHCP:
457 bootp_reset();
458 net_ip.s_addr = 0;
459 dhcp_request(); /* Basically same as BOOTP */
460 break;
461 #endif
462
463 case BOOTP:
464 bootp_reset();
465 net_ip.s_addr = 0;
466 bootp_request();
467 break;
468
469 #if defined(CONFIG_CMD_RARP)
470 case RARP:
471 rarp_try = 0;
472 net_ip.s_addr = 0;
473 rarp_request();
474 break;
475 #endif
476 #if defined(CONFIG_CMD_PING)
477 case PING:
478 ping_start();
479 break;
480 #endif
481 #if defined(CONFIG_CMD_NFS)
482 case NFS:
483 nfs_start();
484 break;
485 #endif
486 #if defined(CONFIG_CMD_CDP)
487 case CDP:
488 cdp_start();
489 break;
490 #endif
491 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
492 case NETCONS:
493 nc_start();
494 break;
495 #endif
496 #if defined(CONFIG_CMD_SNTP)
497 case SNTP:
498 sntp_start();
499 break;
500 #endif
501 #if defined(CONFIG_CMD_DNS)
502 case DNS:
503 dns_start();
504 break;
505 #endif
506 #if defined(CONFIG_CMD_LINK_LOCAL)
507 case LINKLOCAL:
508 link_local_start();
509 break;
510 #endif
511 default:
512 break;
513 }
514
515 break;
516 }
517
518 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
519 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
520 defined(CONFIG_STATUS_LED) && \
521 defined(STATUS_LED_RED)
522 /*
523 * Echo the inverted link state to the fault LED.
524 */
525 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
526 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
527 else
528 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
529 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
530 #endif /* CONFIG_MII, ... */
531 #ifdef CONFIG_USB_KEYBOARD
532 net_busy_flag = 1;
533 #endif
534
535 /*
536 * Main packet reception loop. Loop receiving packets until
537 * someone sets `net_state' to a state that terminates.
538 */
539 for (;;) {
540 WATCHDOG_RESET();
541 #ifdef CONFIG_SHOW_ACTIVITY
542 show_activity(1);
543 #endif
544 /*
545 * Check the ethernet for a new packet. The ethernet
546 * receive routine will process it.
547 * Most drivers return the most recent packet size, but not
548 * errors that may have happened.
549 */
550 eth_rx();
551
552 /*
553 * Abort if ctrl-c was pressed.
554 */
555 if (ctrlc()) {
556 /* cancel any ARP that may not have completed */
557 net_arp_wait_packet_ip.s_addr = 0;
558
559 net_cleanup_loop();
560 eth_halt();
561 /* Invalidate the last protocol */
562 eth_set_last_protocol(BOOTP);
563
564 puts("\nAbort\n");
565 /* include a debug print as well incase the debug
566 messages are directed to stderr */
567 debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
568 goto done;
569 }
570
571 arp_timeout_check();
572
573 /*
574 * Check for a timeout, and run the timeout handler
575 * if we have one.
576 */
577 if (time_handler &&
578 ((get_timer(0) - time_start) > time_delta)) {
579 thand_f *x;
580
581 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
582 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
583 defined(CONFIG_STATUS_LED) && \
584 defined(STATUS_LED_RED)
585 /*
586 * Echo the inverted link state to the fault LED.
587 */
588 if (miiphy_link(eth_get_dev()->name,
589 CONFIG_SYS_FAULT_MII_ADDR))
590 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
591 else
592 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
593 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
594 #endif /* CONFIG_MII, ... */
595 debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
596 x = time_handler;
597 time_handler = (thand_f *)0;
598 (*x)();
599 }
600
601 if (net_state == NETLOOP_FAIL)
602 ret = net_start_again();
603
604 switch (net_state) {
605 case NETLOOP_RESTART:
606 net_restarted = 1;
607 goto restart;
608
609 case NETLOOP_SUCCESS:
610 net_cleanup_loop();
611 if (net_boot_file_size > 0) {
612 printf("Bytes transferred = %d (%x hex)\n",
613 net_boot_file_size, net_boot_file_size);
614 setenv_hex("filesize", net_boot_file_size);
615 setenv_hex("fileaddr", load_addr);
616 }
617 if (protocol != NETCONS)
618 eth_halt();
619 else
620 eth_halt_state_only();
621
622 eth_set_last_protocol(protocol);
623
624 ret = net_boot_file_size;
625 debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
626 goto done;
627
628 case NETLOOP_FAIL:
629 net_cleanup_loop();
630 /* Invalidate the last protocol */
631 eth_set_last_protocol(BOOTP);
632 debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
633 goto done;
634
635 case NETLOOP_CONTINUE:
636 continue;
637 }
638 }
639
640 done:
641 #ifdef CONFIG_USB_KEYBOARD
642 net_busy_flag = 0;
643 #endif
644 #ifdef CONFIG_CMD_TFTPPUT
645 /* Clear out the handlers */
646 net_set_udp_handler(NULL);
647 net_set_icmp_handler(NULL);
648 #endif
649 return ret;
650 }
651
652 /**********************************************************************/
653
654 static void start_again_timeout_handler(void)
655 {
656 net_set_state(NETLOOP_RESTART);
657 }
658
659 int net_start_again(void)
660 {
661 char *nretry;
662 int retry_forever = 0;
663 unsigned long retrycnt = 0;
664 int ret;
665
666 nretry = getenv("netretry");
667 if (nretry) {
668 if (!strcmp(nretry, "yes"))
669 retry_forever = 1;
670 else if (!strcmp(nretry, "no"))
671 retrycnt = 0;
672 else if (!strcmp(nretry, "once"))
673 retrycnt = 1;
674 else
675 retrycnt = simple_strtoul(nretry, NULL, 0);
676 } else {
677 retrycnt = 0;
678 retry_forever = 0;
679 }
680
681 if ((!retry_forever) && (net_try_count >= retrycnt)) {
682 eth_halt();
683 net_set_state(NETLOOP_FAIL);
684 /*
685 * We don't provide a way for the protocol to return an error,
686 * but this is almost always the reason.
687 */
688 return -ETIMEDOUT;
689 }
690
691 net_try_count++;
692
693 eth_halt();
694 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
695 eth_try_another(!net_restarted);
696 #endif
697 ret = eth_init();
698 if (net_restart_wrap) {
699 net_restart_wrap = 0;
700 if (net_dev_exists) {
701 net_set_timeout_handler(10000UL,
702 start_again_timeout_handler);
703 net_set_udp_handler(NULL);
704 } else {
705 net_set_state(NETLOOP_FAIL);
706 }
707 } else {
708 net_set_state(NETLOOP_RESTART);
709 }
710 return ret;
711 }
712
713 /**********************************************************************/
714 /*
715 * Miscelaneous bits.
716 */
717
718 static void dummy_handler(uchar *pkt, unsigned dport,
719 struct in_addr sip, unsigned sport,
720 unsigned len)
721 {
722 }
723
724 rxhand_f *net_get_udp_handler(void)
725 {
726 return udp_packet_handler;
727 }
728
729 void net_set_udp_handler(rxhand_f *f)
730 {
731 debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
732 if (f == NULL)
733 udp_packet_handler = dummy_handler;
734 else
735 udp_packet_handler = f;
736 }
737
738 rxhand_f *net_get_arp_handler(void)
739 {
740 return arp_packet_handler;
741 }
742
743 void net_set_arp_handler(rxhand_f *f)
744 {
745 debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
746 if (f == NULL)
747 arp_packet_handler = dummy_handler;
748 else
749 arp_packet_handler = f;
750 }
751
752 #ifdef CONFIG_CMD_TFTPPUT
753 void net_set_icmp_handler(rxhand_icmp_f *f)
754 {
755 packet_icmp_handler = f;
756 }
757 #endif
758
759 void net_set_timeout_handler(ulong iv, thand_f *f)
760 {
761 if (iv == 0) {
762 debug_cond(DEBUG_INT_STATE,
763 "--- net_loop timeout handler cancelled\n");
764 time_handler = (thand_f *)0;
765 } else {
766 debug_cond(DEBUG_INT_STATE,
767 "--- net_loop timeout handler set (%p)\n", f);
768 time_handler = f;
769 time_start = get_timer(0);
770 time_delta = iv * CONFIG_SYS_HZ / 1000;
771 }
772 }
773
774 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
775 int payload_len)
776 {
777 uchar *pkt;
778 int eth_hdr_size;
779 int pkt_hdr_size;
780
781 /* make sure the net_tx_packet is initialized (net_init() was called) */
782 assert(net_tx_packet != NULL);
783 if (net_tx_packet == NULL)
784 return -1;
785
786 /* convert to new style broadcast */
787 if (dest.s_addr == 0)
788 dest.s_addr = 0xFFFFFFFF;
789
790 /* if broadcast, make the ether address a broadcast and don't do ARP */
791 if (dest.s_addr == 0xFFFFFFFF)
792 ether = (uchar *)net_bcast_ethaddr;
793
794 pkt = (uchar *)net_tx_packet;
795
796 eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
797 pkt += eth_hdr_size;
798 net_set_udp_header(pkt, dest, dport, sport, payload_len);
799 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
800
801 /* if MAC address was not discovered yet, do an ARP request */
802 if (memcmp(ether, net_null_ethaddr, 6) == 0) {
803 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
804
805 /* save the ip and eth addr for the packet to send after arp */
806 net_arp_wait_packet_ip = dest;
807 arp_wait_packet_ethaddr = ether;
808
809 /* size of the waiting packet */
810 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
811
812 /* and do the ARP request */
813 arp_wait_try = 1;
814 arp_wait_timer_start = get_timer(0);
815 arp_request();
816 return 1; /* waiting */
817 } else {
818 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
819 &dest, ether);
820 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
821 return 0; /* transmitted */
822 }
823 }
824
825 #ifdef CONFIG_IP_DEFRAG
826 /*
827 * This function collects fragments in a single packet, according
828 * to the algorithm in RFC815. It returns NULL or the pointer to
829 * a complete packet, in static storage
830 */
831 #ifndef CONFIG_NET_MAXDEFRAG
832 #define CONFIG_NET_MAXDEFRAG 16384
833 #endif
834 /*
835 * MAXDEFRAG, above, is chosen in the config file and is real data
836 * so we need to add the NFS overhead, which is more than TFTP.
837 * To use sizeof in the internal unnamed structures, we need a real
838 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
839 * The compiler doesn't complain nor allocates the actual structure
840 */
841 static struct rpc_t rpc_specimen;
842 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
843
844 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
845
846 /*
847 * this is the packet being assembled, either data or frag control.
848 * Fragments go by 8 bytes, so this union must be 8 bytes long
849 */
850 struct hole {
851 /* first_byte is address of this structure */
852 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
853 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
854 u16 prev_hole; /* index of prev, 0 == none */
855 u16 unused;
856 };
857
858 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
859 {
860 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
861 static u16 first_hole, total_len;
862 struct hole *payload, *thisfrag, *h, *newh;
863 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
864 uchar *indata = (uchar *)ip;
865 int offset8, start, len, done = 0;
866 u16 ip_off = ntohs(ip->ip_off);
867
868 /* payload starts after IP header, this fragment is in there */
869 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
870 offset8 = (ip_off & IP_OFFS);
871 thisfrag = payload + offset8;
872 start = offset8 * 8;
873 len = ntohs(ip->ip_len) - IP_HDR_SIZE;
874
875 if (start + len > IP_MAXUDP) /* fragment extends too far */
876 return NULL;
877
878 if (!total_len || localip->ip_id != ip->ip_id) {
879 /* new (or different) packet, reset structs */
880 total_len = 0xffff;
881 payload[0].last_byte = ~0;
882 payload[0].next_hole = 0;
883 payload[0].prev_hole = 0;
884 first_hole = 0;
885 /* any IP header will work, copy the first we received */
886 memcpy(localip, ip, IP_HDR_SIZE);
887 }
888
889 /*
890 * What follows is the reassembly algorithm. We use the payload
891 * array as a linked list of hole descriptors, as each hole starts
892 * at a multiple of 8 bytes. However, last byte can be whatever value,
893 * so it is represented as byte count, not as 8-byte blocks.
894 */
895
896 h = payload + first_hole;
897 while (h->last_byte < start) {
898 if (!h->next_hole) {
899 /* no hole that far away */
900 return NULL;
901 }
902 h = payload + h->next_hole;
903 }
904
905 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
906 if (offset8 + ((len + 7) / 8) <= h - payload) {
907 /* no overlap with holes (dup fragment?) */
908 return NULL;
909 }
910
911 if (!(ip_off & IP_FLAGS_MFRAG)) {
912 /* no more fragmentss: truncate this (last) hole */
913 total_len = start + len;
914 h->last_byte = start + len;
915 }
916
917 /*
918 * There is some overlap: fix the hole list. This code doesn't
919 * deal with a fragment that overlaps with two different holes
920 * (thus being a superset of a previously-received fragment).
921 */
922
923 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
924 /* complete overlap with hole: remove hole */
925 if (!h->prev_hole && !h->next_hole) {
926 /* last remaining hole */
927 done = 1;
928 } else if (!h->prev_hole) {
929 /* first hole */
930 first_hole = h->next_hole;
931 payload[h->next_hole].prev_hole = 0;
932 } else if (!h->next_hole) {
933 /* last hole */
934 payload[h->prev_hole].next_hole = 0;
935 } else {
936 /* in the middle of the list */
937 payload[h->next_hole].prev_hole = h->prev_hole;
938 payload[h->prev_hole].next_hole = h->next_hole;
939 }
940
941 } else if (h->last_byte <= start + len) {
942 /* overlaps with final part of the hole: shorten this hole */
943 h->last_byte = start;
944
945 } else if (h >= thisfrag) {
946 /* overlaps with initial part of the hole: move this hole */
947 newh = thisfrag + (len / 8);
948 *newh = *h;
949 h = newh;
950 if (h->next_hole)
951 payload[h->next_hole].prev_hole = (h - payload);
952 if (h->prev_hole)
953 payload[h->prev_hole].next_hole = (h - payload);
954 else
955 first_hole = (h - payload);
956
957 } else {
958 /* fragment sits in the middle: split the hole */
959 newh = thisfrag + (len / 8);
960 *newh = *h;
961 h->last_byte = start;
962 h->next_hole = (newh - payload);
963 newh->prev_hole = (h - payload);
964 if (newh->next_hole)
965 payload[newh->next_hole].prev_hole = (newh - payload);
966 }
967
968 /* finally copy this fragment and possibly return whole packet */
969 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
970 if (!done)
971 return NULL;
972
973 localip->ip_len = htons(total_len);
974 *lenp = total_len + IP_HDR_SIZE;
975 return localip;
976 }
977
978 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
979 int *lenp)
980 {
981 u16 ip_off = ntohs(ip->ip_off);
982 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
983 return ip; /* not a fragment */
984 return __net_defragment(ip, lenp);
985 }
986
987 #else /* !CONFIG_IP_DEFRAG */
988
989 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
990 int *lenp)
991 {
992 u16 ip_off = ntohs(ip->ip_off);
993 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
994 return ip; /* not a fragment */
995 return NULL;
996 }
997 #endif
998
999 /**
1000 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1001 * drop others.
1002 *
1003 * @parma ip IP packet containing the ICMP
1004 */
1005 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1006 struct in_addr src_ip, struct ethernet_hdr *et)
1007 {
1008 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1009
1010 switch (icmph->type) {
1011 case ICMP_REDIRECT:
1012 if (icmph->code != ICMP_REDIR_HOST)
1013 return;
1014 printf(" ICMP Host Redirect to %pI4 ",
1015 &icmph->un.gateway);
1016 break;
1017 default:
1018 #if defined(CONFIG_CMD_PING)
1019 ping_receive(et, ip, len);
1020 #endif
1021 #ifdef CONFIG_CMD_TFTPPUT
1022 if (packet_icmp_handler)
1023 packet_icmp_handler(icmph->type, icmph->code,
1024 ntohs(ip->udp_dst), src_ip,
1025 ntohs(ip->udp_src), icmph->un.data,
1026 ntohs(ip->udp_len));
1027 #endif
1028 break;
1029 }
1030 }
1031
1032 void net_process_received_packet(uchar *in_packet, int len)
1033 {
1034 struct ethernet_hdr *et;
1035 struct ip_udp_hdr *ip;
1036 struct in_addr dst_ip;
1037 struct in_addr src_ip;
1038 int eth_proto;
1039 #if defined(CONFIG_CMD_CDP)
1040 int iscdp;
1041 #endif
1042 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1043
1044 debug_cond(DEBUG_NET_PKT, "packet received\n");
1045
1046 net_rx_packet = in_packet;
1047 net_rx_packet_len = len;
1048 et = (struct ethernet_hdr *)in_packet;
1049
1050 /* too small packet? */
1051 if (len < ETHER_HDR_SIZE)
1052 return;
1053
1054 #ifdef CONFIG_API
1055 if (push_packet) {
1056 (*push_packet)(in_packet, len);
1057 return;
1058 }
1059 #endif
1060
1061 #if defined(CONFIG_CMD_CDP)
1062 /* keep track if packet is CDP */
1063 iscdp = is_cdp_packet(et->et_dest);
1064 #endif
1065
1066 myvlanid = ntohs(net_our_vlan);
1067 if (myvlanid == (ushort)-1)
1068 myvlanid = VLAN_NONE;
1069 mynvlanid = ntohs(net_native_vlan);
1070 if (mynvlanid == (ushort)-1)
1071 mynvlanid = VLAN_NONE;
1072
1073 eth_proto = ntohs(et->et_protlen);
1074
1075 if (eth_proto < 1514) {
1076 struct e802_hdr *et802 = (struct e802_hdr *)et;
1077 /*
1078 * Got a 802.2 packet. Check the other protocol field.
1079 * XXX VLAN over 802.2+SNAP not implemented!
1080 */
1081 eth_proto = ntohs(et802->et_prot);
1082
1083 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1084 len -= E802_HDR_SIZE;
1085
1086 } else if (eth_proto != PROT_VLAN) { /* normal packet */
1087 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1088 len -= ETHER_HDR_SIZE;
1089
1090 } else { /* VLAN packet */
1091 struct vlan_ethernet_hdr *vet =
1092 (struct vlan_ethernet_hdr *)et;
1093
1094 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1095
1096 /* too small packet? */
1097 if (len < VLAN_ETHER_HDR_SIZE)
1098 return;
1099
1100 /* if no VLAN active */
1101 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1102 #if defined(CONFIG_CMD_CDP)
1103 && iscdp == 0
1104 #endif
1105 )
1106 return;
1107
1108 cti = ntohs(vet->vet_tag);
1109 vlanid = cti & VLAN_IDMASK;
1110 eth_proto = ntohs(vet->vet_type);
1111
1112 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1113 len -= VLAN_ETHER_HDR_SIZE;
1114 }
1115
1116 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1117
1118 #if defined(CONFIG_CMD_CDP)
1119 if (iscdp) {
1120 cdp_receive((uchar *)ip, len);
1121 return;
1122 }
1123 #endif
1124
1125 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1126 if (vlanid == VLAN_NONE)
1127 vlanid = (mynvlanid & VLAN_IDMASK);
1128 /* not matched? */
1129 if (vlanid != (myvlanid & VLAN_IDMASK))
1130 return;
1131 }
1132
1133 switch (eth_proto) {
1134 case PROT_ARP:
1135 arp_receive(et, ip, len);
1136 break;
1137
1138 #ifdef CONFIG_CMD_RARP
1139 case PROT_RARP:
1140 rarp_receive(ip, len);
1141 break;
1142 #endif
1143 case PROT_IP:
1144 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1145 /* Before we start poking the header, make sure it is there */
1146 if (len < IP_UDP_HDR_SIZE) {
1147 debug("len bad %d < %lu\n", len,
1148 (ulong)IP_UDP_HDR_SIZE);
1149 return;
1150 }
1151 /* Check the packet length */
1152 if (len < ntohs(ip->ip_len)) {
1153 debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1154 return;
1155 }
1156 len = ntohs(ip->ip_len);
1157 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1158 len, ip->ip_hl_v & 0xff);
1159
1160 /* Can't deal with anything except IPv4 */
1161 if ((ip->ip_hl_v & 0xf0) != 0x40)
1162 return;
1163 /* Can't deal with IP options (headers != 20 bytes) */
1164 if ((ip->ip_hl_v & 0x0f) > 0x05)
1165 return;
1166 /* Check the Checksum of the header */
1167 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1168 debug("checksum bad\n");
1169 return;
1170 }
1171 /* If it is not for us, ignore it */
1172 dst_ip = net_read_ip(&ip->ip_dst);
1173 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1174 dst_ip.s_addr != 0xFFFFFFFF) {
1175 #ifdef CONFIG_MCAST_TFTP
1176 if (net_mcast_addr != dst_ip)
1177 #endif
1178 return;
1179 }
1180 /* Read source IP address for later use */
1181 src_ip = net_read_ip(&ip->ip_src);
1182 /*
1183 * The function returns the unchanged packet if it's not
1184 * a fragment, and either the complete packet or NULL if
1185 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1186 */
1187 ip = net_defragment(ip, &len);
1188 if (!ip)
1189 return;
1190 /*
1191 * watch for ICMP host redirects
1192 *
1193 * There is no real handler code (yet). We just watch
1194 * for ICMP host redirect messages. In case anybody
1195 * sees these messages: please contact me
1196 * (wd@denx.de), or - even better - send me the
1197 * necessary fixes :-)
1198 *
1199 * Note: in all cases where I have seen this so far
1200 * it was a problem with the router configuration,
1201 * for instance when a router was configured in the
1202 * BOOTP reply, but the TFTP server was on the same
1203 * subnet. So this is probably a warning that your
1204 * configuration might be wrong. But I'm not really
1205 * sure if there aren't any other situations.
1206 *
1207 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1208 * we send a tftp packet to a dead connection, or when
1209 * there is no server at the other end.
1210 */
1211 if (ip->ip_p == IPPROTO_ICMP) {
1212 receive_icmp(ip, len, src_ip, et);
1213 return;
1214 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1215 return;
1216 }
1217
1218 debug_cond(DEBUG_DEV_PKT,
1219 "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1220 &dst_ip, &src_ip, len);
1221
1222 #ifdef CONFIG_UDP_CHECKSUM
1223 if (ip->udp_xsum != 0) {
1224 ulong xsum;
1225 ushort *sumptr;
1226 ushort sumlen;
1227
1228 xsum = ip->ip_p;
1229 xsum += (ntohs(ip->udp_len));
1230 xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1231 xsum += (ntohl(ip->ip_src.s_addr) >> 0) & 0x0000ffff;
1232 xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1233 xsum += (ntohl(ip->ip_dst.s_addr) >> 0) & 0x0000ffff;
1234
1235 sumlen = ntohs(ip->udp_len);
1236 sumptr = (ushort *)&(ip->udp_src);
1237
1238 while (sumlen > 1) {
1239 ushort sumdata;
1240
1241 sumdata = *sumptr++;
1242 xsum += ntohs(sumdata);
1243 sumlen -= 2;
1244 }
1245 if (sumlen > 0) {
1246 ushort sumdata;
1247
1248 sumdata = *(unsigned char *)sumptr;
1249 sumdata = (sumdata << 8) & 0xff00;
1250 xsum += sumdata;
1251 }
1252 while ((xsum >> 16) != 0) {
1253 xsum = (xsum & 0x0000ffff) +
1254 ((xsum >> 16) & 0x0000ffff);
1255 }
1256 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1257 printf(" UDP wrong checksum %08lx %08x\n",
1258 xsum, ntohs(ip->udp_xsum));
1259 return;
1260 }
1261 }
1262 #endif
1263
1264 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
1265 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1266 src_ip,
1267 ntohs(ip->udp_dst),
1268 ntohs(ip->udp_src),
1269 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1270 #endif
1271 /*
1272 * IP header OK. Pass the packet to the current handler.
1273 */
1274 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1275 ntohs(ip->udp_dst),
1276 src_ip,
1277 ntohs(ip->udp_src),
1278 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1279 break;
1280 }
1281 }
1282
1283 /**********************************************************************/
1284
1285 static int net_check_prereq(enum proto_t protocol)
1286 {
1287 switch (protocol) {
1288 /* Fall through */
1289 #if defined(CONFIG_CMD_PING)
1290 case PING:
1291 if (net_ping_ip.s_addr == 0) {
1292 puts("*** ERROR: ping address not given\n");
1293 return 1;
1294 }
1295 goto common;
1296 #endif
1297 #if defined(CONFIG_CMD_SNTP)
1298 case SNTP:
1299 if (net_ntp_server.s_addr == 0) {
1300 puts("*** ERROR: NTP server address not given\n");
1301 return 1;
1302 }
1303 goto common;
1304 #endif
1305 #if defined(CONFIG_CMD_DNS)
1306 case DNS:
1307 if (net_dns_server.s_addr == 0) {
1308 puts("*** ERROR: DNS server address not given\n");
1309 return 1;
1310 }
1311 goto common;
1312 #endif
1313 #if defined(CONFIG_CMD_NFS)
1314 case NFS:
1315 #endif
1316 /* Fall through */
1317 case TFTPGET:
1318 case TFTPPUT:
1319 if (net_server_ip.s_addr == 0) {
1320 puts("*** ERROR: `serverip' not set\n");
1321 return 1;
1322 }
1323 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1324 defined(CONFIG_CMD_DNS)
1325 common:
1326 #endif
1327 /* Fall through */
1328
1329 case NETCONS:
1330 case TFTPSRV:
1331 if (net_ip.s_addr == 0) {
1332 puts("*** ERROR: `ipaddr' not set\n");
1333 return 1;
1334 }
1335 /* Fall through */
1336
1337 #ifdef CONFIG_CMD_RARP
1338 case RARP:
1339 #endif
1340 case BOOTP:
1341 case CDP:
1342 case DHCP:
1343 case LINKLOCAL:
1344 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1345 int num = eth_get_dev_index();
1346
1347 switch (num) {
1348 case -1:
1349 puts("*** ERROR: No ethernet found.\n");
1350 return 1;
1351 case 0:
1352 puts("*** ERROR: `ethaddr' not set\n");
1353 break;
1354 default:
1355 printf("*** ERROR: `eth%daddr' not set\n",
1356 num);
1357 break;
1358 }
1359
1360 net_start_again();
1361 return 2;
1362 }
1363 /* Fall through */
1364 default:
1365 return 0;
1366 }
1367 return 0; /* OK */
1368 }
1369 /**********************************************************************/
1370
1371 int
1372 net_eth_hdr_size(void)
1373 {
1374 ushort myvlanid;
1375
1376 myvlanid = ntohs(net_our_vlan);
1377 if (myvlanid == (ushort)-1)
1378 myvlanid = VLAN_NONE;
1379
1380 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1381 VLAN_ETHER_HDR_SIZE;
1382 }
1383
1384 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1385 {
1386 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1387 ushort myvlanid;
1388
1389 myvlanid = ntohs(net_our_vlan);
1390 if (myvlanid == (ushort)-1)
1391 myvlanid = VLAN_NONE;
1392
1393 memcpy(et->et_dest, dest_ethaddr, 6);
1394 memcpy(et->et_src, net_ethaddr, 6);
1395 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1396 et->et_protlen = htons(prot);
1397 return ETHER_HDR_SIZE;
1398 } else {
1399 struct vlan_ethernet_hdr *vet =
1400 (struct vlan_ethernet_hdr *)xet;
1401
1402 vet->vet_vlan_type = htons(PROT_VLAN);
1403 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1404 vet->vet_type = htons(prot);
1405 return VLAN_ETHER_HDR_SIZE;
1406 }
1407 }
1408
1409 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1410 {
1411 ushort protlen;
1412
1413 memcpy(et->et_dest, addr, 6);
1414 memcpy(et->et_src, net_ethaddr, 6);
1415 protlen = ntohs(et->et_protlen);
1416 if (protlen == PROT_VLAN) {
1417 struct vlan_ethernet_hdr *vet =
1418 (struct vlan_ethernet_hdr *)et;
1419 vet->vet_type = htons(prot);
1420 return VLAN_ETHER_HDR_SIZE;
1421 } else if (protlen > 1514) {
1422 et->et_protlen = htons(prot);
1423 return ETHER_HDR_SIZE;
1424 } else {
1425 /* 802.2 + SNAP */
1426 struct e802_hdr *et802 = (struct e802_hdr *)et;
1427 et802->et_prot = htons(prot);
1428 return E802_HDR_SIZE;
1429 }
1430 }
1431
1432 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1433 {
1434 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1435
1436 /*
1437 * Construct an IP header.
1438 */
1439 /* IP_HDR_SIZE / 4 (not including UDP) */
1440 ip->ip_hl_v = 0x45;
1441 ip->ip_tos = 0;
1442 ip->ip_len = htons(IP_HDR_SIZE);
1443 ip->ip_id = htons(net_ip_id++);
1444 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1445 ip->ip_ttl = 255;
1446 ip->ip_sum = 0;
1447 /* already in network byte order */
1448 net_copy_ip((void *)&ip->ip_src, &source);
1449 /* already in network byte order */
1450 net_copy_ip((void *)&ip->ip_dst, &dest);
1451 }
1452
1453 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1454 int len)
1455 {
1456 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1457
1458 /*
1459 * If the data is an odd number of bytes, zero the
1460 * byte after the last byte so that the checksum
1461 * will work.
1462 */
1463 if (len & 1)
1464 pkt[IP_UDP_HDR_SIZE + len] = 0;
1465
1466 net_set_ip_header(pkt, dest, net_ip);
1467 ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
1468 ip->ip_p = IPPROTO_UDP;
1469 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
1470
1471 ip->udp_src = htons(sport);
1472 ip->udp_dst = htons(dport);
1473 ip->udp_len = htons(UDP_HDR_SIZE + len);
1474 ip->udp_xsum = 0;
1475 }
1476
1477 void copy_filename(char *dst, const char *src, int size)
1478 {
1479 if (*src && (*src == '"')) {
1480 ++src;
1481 --size;
1482 }
1483
1484 while ((--size > 0) && *src && (*src != '"'))
1485 *dst++ = *src++;
1486 *dst = '\0';
1487 }
1488
1489 #if defined(CONFIG_CMD_NFS) || \
1490 defined(CONFIG_CMD_SNTP) || \
1491 defined(CONFIG_CMD_DNS)
1492 /*
1493 * make port a little random (1024-17407)
1494 * This keeps the math somewhat trivial to compute, and seems to work with
1495 * all supported protocols/clients/servers
1496 */
1497 unsigned int random_port(void)
1498 {
1499 return 1024 + (get_timer(0) % 0x4000);
1500 }
1501 #endif
1502
1503 void ip_to_string(struct in_addr x, char *s)
1504 {
1505 x.s_addr = ntohl(x.s_addr);
1506 sprintf(s, "%d.%d.%d.%d",
1507 (int) ((x.s_addr >> 24) & 0xff),
1508 (int) ((x.s_addr >> 16) & 0xff),
1509 (int) ((x.s_addr >> 8) & 0xff),
1510 (int) ((x.s_addr >> 0) & 0xff)
1511 );
1512 }
1513
1514 void vlan_to_string(ushort x, char *s)
1515 {
1516 x = ntohs(x);
1517
1518 if (x == (ushort)-1)
1519 x = VLAN_NONE;
1520
1521 if (x == VLAN_NONE)
1522 strcpy(s, "none");
1523 else
1524 sprintf(s, "%d", x & VLAN_IDMASK);
1525 }
1526
1527 ushort string_to_vlan(const char *s)
1528 {
1529 ushort id;
1530
1531 if (s == NULL)
1532 return htons(VLAN_NONE);
1533
1534 if (*s < '0' || *s > '9')
1535 id = VLAN_NONE;
1536 else
1537 id = (ushort)simple_strtoul(s, NULL, 10);
1538
1539 return htons(id);
1540 }
1541
1542 ushort getenv_vlan(char *var)
1543 {
1544 return string_to_vlan(getenv(var));
1545 }
"Das U-Boot" Source Tree