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