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net: bootp fix vci string on SPL-Boot
[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 #include <net/tftp.h>
90 #if defined(CONFIG_STATUS_LED)
91 #include <miiphy.h>
92 #include <status_led.h>
93 #endif
94 #include <watchdog.h>
95 #include <linux/compiler.h>
96 #include "arp.h"
97 #include "bootp.h"
98 #include "cdp.h"
99 #if defined(CONFIG_CMD_DNS)
100 #include "dns.h"
101 #endif
102 #include "link_local.h"
103 #include "nfs.h"
104 #include "ping.h"
105 #include "rarp.h"
106 #if defined(CONFIG_CMD_SNTP)
107 #include "sntp.h"
108 #endif
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 ret = -EINTR;
569 goto done;
570 }
571
572 arp_timeout_check();
573
574 /*
575 * Check for a timeout, and run the timeout handler
576 * if we have one.
577 */
578 if (time_handler &&
579 ((get_timer(0) - time_start) > time_delta)) {
580 thand_f *x;
581
582 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
583 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
584 defined(CONFIG_STATUS_LED) && \
585 defined(STATUS_LED_RED)
586 /*
587 * Echo the inverted link state to the fault LED.
588 */
589 if (miiphy_link(eth_get_dev()->name,
590 CONFIG_SYS_FAULT_MII_ADDR))
591 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
592 else
593 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
594 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
595 #endif /* CONFIG_MII, ... */
596 debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
597 x = time_handler;
598 time_handler = (thand_f *)0;
599 (*x)();
600 }
601
602 if (net_state == NETLOOP_FAIL)
603 ret = net_start_again();
604
605 switch (net_state) {
606 case NETLOOP_RESTART:
607 net_restarted = 1;
608 goto restart;
609
610 case NETLOOP_SUCCESS:
611 net_cleanup_loop();
612 if (net_boot_file_size > 0) {
613 printf("Bytes transferred = %d (%x hex)\n",
614 net_boot_file_size, net_boot_file_size);
615 setenv_hex("filesize", net_boot_file_size);
616 setenv_hex("fileaddr", load_addr);
617 }
618 if (protocol != NETCONS)
619 eth_halt();
620 else
621 eth_halt_state_only();
622
623 eth_set_last_protocol(protocol);
624
625 ret = net_boot_file_size;
626 debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
627 goto done;
628
629 case NETLOOP_FAIL:
630 net_cleanup_loop();
631 /* Invalidate the last protocol */
632 eth_set_last_protocol(BOOTP);
633 debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
634 goto done;
635
636 case NETLOOP_CONTINUE:
637 continue;
638 }
639 }
640
641 done:
642 #ifdef CONFIG_USB_KEYBOARD
643 net_busy_flag = 0;
644 #endif
645 #ifdef CONFIG_CMD_TFTPPUT
646 /* Clear out the handlers */
647 net_set_udp_handler(NULL);
648 net_set_icmp_handler(NULL);
649 #endif
650 return ret;
651 }
652
653 /**********************************************************************/
654
655 static void start_again_timeout_handler(void)
656 {
657 net_set_state(NETLOOP_RESTART);
658 }
659
660 int net_start_again(void)
661 {
662 char *nretry;
663 int retry_forever = 0;
664 unsigned long retrycnt = 0;
665 int ret;
666
667 nretry = getenv("netretry");
668 if (nretry) {
669 if (!strcmp(nretry, "yes"))
670 retry_forever = 1;
671 else if (!strcmp(nretry, "no"))
672 retrycnt = 0;
673 else if (!strcmp(nretry, "once"))
674 retrycnt = 1;
675 else
676 retrycnt = simple_strtoul(nretry, NULL, 0);
677 } else {
678 retrycnt = 0;
679 retry_forever = 0;
680 }
681
682 if ((!retry_forever) && (net_try_count >= retrycnt)) {
683 eth_halt();
684 net_set_state(NETLOOP_FAIL);
685 /*
686 * We don't provide a way for the protocol to return an error,
687 * but this is almost always the reason.
688 */
689 return -ETIMEDOUT;
690 }
691
692 net_try_count++;
693
694 eth_halt();
695 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
696 eth_try_another(!net_restarted);
697 #endif
698 ret = eth_init();
699 if (net_restart_wrap) {
700 net_restart_wrap = 0;
701 if (net_dev_exists) {
702 net_set_timeout_handler(10000UL,
703 start_again_timeout_handler);
704 net_set_udp_handler(NULL);
705 } else {
706 net_set_state(NETLOOP_FAIL);
707 }
708 } else {
709 net_set_state(NETLOOP_RESTART);
710 }
711 return ret;
712 }
713
714 /**********************************************************************/
715 /*
716 * Miscelaneous bits.
717 */
718
719 static void dummy_handler(uchar *pkt, unsigned dport,
720 struct in_addr sip, unsigned sport,
721 unsigned len)
722 {
723 }
724
725 rxhand_f *net_get_udp_handler(void)
726 {
727 return udp_packet_handler;
728 }
729
730 void net_set_udp_handler(rxhand_f *f)
731 {
732 debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
733 if (f == NULL)
734 udp_packet_handler = dummy_handler;
735 else
736 udp_packet_handler = f;
737 }
738
739 rxhand_f *net_get_arp_handler(void)
740 {
741 return arp_packet_handler;
742 }
743
744 void net_set_arp_handler(rxhand_f *f)
745 {
746 debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
747 if (f == NULL)
748 arp_packet_handler = dummy_handler;
749 else
750 arp_packet_handler = f;
751 }
752
753 #ifdef CONFIG_CMD_TFTPPUT
754 void net_set_icmp_handler(rxhand_icmp_f *f)
755 {
756 packet_icmp_handler = f;
757 }
758 #endif
759
760 void net_set_timeout_handler(ulong iv, thand_f *f)
761 {
762 if (iv == 0) {
763 debug_cond(DEBUG_INT_STATE,
764 "--- net_loop timeout handler cancelled\n");
765 time_handler = (thand_f *)0;
766 } else {
767 debug_cond(DEBUG_INT_STATE,
768 "--- net_loop timeout handler set (%p)\n", f);
769 time_handler = f;
770 time_start = get_timer(0);
771 time_delta = iv * CONFIG_SYS_HZ / 1000;
772 }
773 }
774
775 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
776 int payload_len)
777 {
778 uchar *pkt;
779 int eth_hdr_size;
780 int pkt_hdr_size;
781
782 /* make sure the net_tx_packet is initialized (net_init() was called) */
783 assert(net_tx_packet != NULL);
784 if (net_tx_packet == NULL)
785 return -1;
786
787 /* convert to new style broadcast */
788 if (dest.s_addr == 0)
789 dest.s_addr = 0xFFFFFFFF;
790
791 /* if broadcast, make the ether address a broadcast and don't do ARP */
792 if (dest.s_addr == 0xFFFFFFFF)
793 ether = (uchar *)net_bcast_ethaddr;
794
795 pkt = (uchar *)net_tx_packet;
796
797 eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
798 pkt += eth_hdr_size;
799 net_set_udp_header(pkt, dest, dport, sport, payload_len);
800 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
801
802 /* if MAC address was not discovered yet, do an ARP request */
803 if (memcmp(ether, net_null_ethaddr, 6) == 0) {
804 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
805
806 /* save the ip and eth addr for the packet to send after arp */
807 net_arp_wait_packet_ip = dest;
808 arp_wait_packet_ethaddr = ether;
809
810 /* size of the waiting packet */
811 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
812
813 /* and do the ARP request */
814 arp_wait_try = 1;
815 arp_wait_timer_start = get_timer(0);
816 arp_request();
817 return 1; /* waiting */
818 } else {
819 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
820 &dest, ether);
821 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
822 return 0; /* transmitted */
823 }
824 }
825
826 #ifdef CONFIG_IP_DEFRAG
827 /*
828 * This function collects fragments in a single packet, according
829 * to the algorithm in RFC815. It returns NULL or the pointer to
830 * a complete packet, in static storage
831 */
832 #ifndef CONFIG_NET_MAXDEFRAG
833 #define CONFIG_NET_MAXDEFRAG 16384
834 #endif
835 /*
836 * MAXDEFRAG, above, is chosen in the config file and is real data
837 * so we need to add the NFS overhead, which is more than TFTP.
838 * To use sizeof in the internal unnamed structures, we need a real
839 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
840 * The compiler doesn't complain nor allocates the actual structure
841 */
842 static struct rpc_t rpc_specimen;
843 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
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 #ifdef CONFIG_API
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) && !(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 TFTPSRV:
1332 if (net_ip.s_addr == 0) {
1333 puts("*** ERROR: `ipaddr' not set\n");
1334 return 1;
1335 }
1336 /* Fall through */
1337
1338 #ifdef CONFIG_CMD_RARP
1339 case RARP:
1340 #endif
1341 case BOOTP:
1342 case CDP:
1343 case DHCP:
1344 case LINKLOCAL:
1345 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1346 int num = eth_get_dev_index();
1347
1348 switch (num) {
1349 case -1:
1350 puts("*** ERROR: No ethernet found.\n");
1351 return 1;
1352 case 0:
1353 puts("*** ERROR: `ethaddr' not set\n");
1354 break;
1355 default:
1356 printf("*** ERROR: `eth%daddr' not set\n",
1357 num);
1358 break;
1359 }
1360
1361 net_start_again();
1362 return 2;
1363 }
1364 /* Fall through */
1365 default:
1366 return 0;
1367 }
1368 return 0; /* OK */
1369 }
1370 /**********************************************************************/
1371
1372 int
1373 net_eth_hdr_size(void)
1374 {
1375 ushort myvlanid;
1376
1377 myvlanid = ntohs(net_our_vlan);
1378 if (myvlanid == (ushort)-1)
1379 myvlanid = VLAN_NONE;
1380
1381 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1382 VLAN_ETHER_HDR_SIZE;
1383 }
1384
1385 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1386 {
1387 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1388 ushort myvlanid;
1389
1390 myvlanid = ntohs(net_our_vlan);
1391 if (myvlanid == (ushort)-1)
1392 myvlanid = VLAN_NONE;
1393
1394 memcpy(et->et_dest, dest_ethaddr, 6);
1395 memcpy(et->et_src, net_ethaddr, 6);
1396 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1397 et->et_protlen = htons(prot);
1398 return ETHER_HDR_SIZE;
1399 } else {
1400 struct vlan_ethernet_hdr *vet =
1401 (struct vlan_ethernet_hdr *)xet;
1402
1403 vet->vet_vlan_type = htons(PROT_VLAN);
1404 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1405 vet->vet_type = htons(prot);
1406 return VLAN_ETHER_HDR_SIZE;
1407 }
1408 }
1409
1410 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1411 {
1412 ushort protlen;
1413
1414 memcpy(et->et_dest, addr, 6);
1415 memcpy(et->et_src, net_ethaddr, 6);
1416 protlen = ntohs(et->et_protlen);
1417 if (protlen == PROT_VLAN) {
1418 struct vlan_ethernet_hdr *vet =
1419 (struct vlan_ethernet_hdr *)et;
1420 vet->vet_type = htons(prot);
1421 return VLAN_ETHER_HDR_SIZE;
1422 } else if (protlen > 1514) {
1423 et->et_protlen = htons(prot);
1424 return ETHER_HDR_SIZE;
1425 } else {
1426 /* 802.2 + SNAP */
1427 struct e802_hdr *et802 = (struct e802_hdr *)et;
1428 et802->et_prot = htons(prot);
1429 return E802_HDR_SIZE;
1430 }
1431 }
1432
1433 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1434 {
1435 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1436
1437 /*
1438 * Construct an IP header.
1439 */
1440 /* IP_HDR_SIZE / 4 (not including UDP) */
1441 ip->ip_hl_v = 0x45;
1442 ip->ip_tos = 0;
1443 ip->ip_len = htons(IP_HDR_SIZE);
1444 ip->ip_id = htons(net_ip_id++);
1445 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1446 ip->ip_ttl = 255;
1447 ip->ip_sum = 0;
1448 /* already in network byte order */
1449 net_copy_ip((void *)&ip->ip_src, &source);
1450 /* already in network byte order */
1451 net_copy_ip((void *)&ip->ip_dst, &dest);
1452 }
1453
1454 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1455 int len)
1456 {
1457 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1458
1459 /*
1460 * If the data is an odd number of bytes, zero the
1461 * byte after the last byte so that the checksum
1462 * will work.
1463 */
1464 if (len & 1)
1465 pkt[IP_UDP_HDR_SIZE + len] = 0;
1466
1467 net_set_ip_header(pkt, dest, net_ip);
1468 ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
1469 ip->ip_p = IPPROTO_UDP;
1470 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
1471
1472 ip->udp_src = htons(sport);
1473 ip->udp_dst = htons(dport);
1474 ip->udp_len = htons(UDP_HDR_SIZE + len);
1475 ip->udp_xsum = 0;
1476 }
1477
1478 void copy_filename(char *dst, const char *src, int size)
1479 {
1480 if (*src && (*src == '"')) {
1481 ++src;
1482 --size;
1483 }
1484
1485 while ((--size > 0) && *src && (*src != '"'))
1486 *dst++ = *src++;
1487 *dst = '\0';
1488 }
1489
1490 #if defined(CONFIG_CMD_NFS) || \
1491 defined(CONFIG_CMD_SNTP) || \
1492 defined(CONFIG_CMD_DNS)
1493 /*
1494 * make port a little random (1024-17407)
1495 * This keeps the math somewhat trivial to compute, and seems to work with
1496 * all supported protocols/clients/servers
1497 */
1498 unsigned int random_port(void)
1499 {
1500 return 1024 + (get_timer(0) % 0x4000);
1501 }
1502 #endif
1503
1504 void ip_to_string(struct in_addr x, char *s)
1505 {
1506 x.s_addr = ntohl(x.s_addr);
1507 sprintf(s, "%d.%d.%d.%d",
1508 (int) ((x.s_addr >> 24) & 0xff),
1509 (int) ((x.s_addr >> 16) & 0xff),
1510 (int) ((x.s_addr >> 8) & 0xff),
1511 (int) ((x.s_addr >> 0) & 0xff)
1512 );
1513 }
1514
1515 void vlan_to_string(ushort x, char *s)
1516 {
1517 x = ntohs(x);
1518
1519 if (x == (ushort)-1)
1520 x = VLAN_NONE;
1521
1522 if (x == VLAN_NONE)
1523 strcpy(s, "none");
1524 else
1525 sprintf(s, "%d", x & VLAN_IDMASK);
1526 }
1527
1528 ushort string_to_vlan(const char *s)
1529 {
1530 ushort id;
1531
1532 if (s == NULL)
1533 return htons(VLAN_NONE);
1534
1535 if (*s < '0' || *s > '9')
1536 id = VLAN_NONE;
1537 else
1538 id = (ushort)simple_strtoul(s, NULL, 10);
1539
1540 return htons(id);
1541 }
1542
1543 ushort getenv_vlan(char *var)
1544 {
1545 return string_to_vlan(getenv(var));
1546 }
"Das U-Boot" Source Tree