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 *
76 * WOL:
77 *
78 * Prerequisites: - own ethernet address
79 * We want: - magic packet or timeout
80 * Next step: none
81 */
82
83
84 #include <common.h>
85 #include <bootstage.h>
86 #include <command.h>
87 #include <console.h>
88 #include <env.h>
89 #include <env_internal.h>
90 #include <errno.h>
91 #include <image.h>
92 #include <log.h>
93 #include <net.h>
94 #include <net/fastboot.h>
95 #include <net/tftp.h>
96 #if defined(CONFIG_CMD_PCAP)
97 #include <net/pcap.h>
98 #endif
99 #include <net/udp.h>
100 #if defined(CONFIG_LED_STATUS)
101 #include <miiphy.h>
102 #include <status_led.h>
103 #endif
104 #include <watchdog.h>
105 #include <linux/compiler.h>
106 #include "arp.h"
107 #include "bootp.h"
108 #include "cdp.h"
109 #if defined(CONFIG_CMD_DNS)
110 #include "dns.h"
111 #endif
112 #include "link_local.h"
113 #include "nfs.h"
114 #include "ping.h"
115 #include "rarp.h"
116 #if defined(CONFIG_CMD_WOL)
117 #include "wol.h"
118 #endif
119
120 /** BOOTP EXTENTIONS **/
121
122 /* Our subnet mask (0=unknown) */
123 struct in_addr net_netmask;
124 /* Our gateways IP address */
125 struct in_addr net_gateway;
126 /* Our DNS IP address */
127 struct in_addr net_dns_server;
128 #if defined(CONFIG_BOOTP_DNS2)
129 /* Our 2nd DNS IP address */
130 struct in_addr net_dns_server2;
131 #endif
132
133 /** END OF BOOTP EXTENTIONS **/
134
135 /* Our ethernet address */
136 u8 net_ethaddr[6];
137 /* Boot server enet address */
138 u8 net_server_ethaddr[6];
139 /* Our IP addr (0 = unknown) */
140 struct in_addr net_ip;
141 /* Server IP addr (0 = unknown) */
142 struct in_addr net_server_ip;
143 /* Current receive packet */
144 uchar *net_rx_packet;
145 /* Current rx packet length */
146 int net_rx_packet_len;
147 /* IP packet ID */
148 static unsigned net_ip_id;
149 /* Ethernet bcast address */
150 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
151 const u8 net_null_ethaddr[6];
152 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
153 void (*push_packet)(void *, int len) = 0;
154 #endif
155 /* Network loop state */
156 enum net_loop_state net_state;
157 /* Tried all network devices */
158 int net_restart_wrap;
159 /* Network loop restarted */
160 static int net_restarted;
161 /* At least one device configured */
162 static int net_dev_exists;
163
164 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
165 /* default is without VLAN */
166 ushort net_our_vlan = 0xFFFF;
167 /* ditto */
168 ushort net_native_vlan = 0xFFFF;
169
170 /* Boot File name */
171 char net_boot_file_name[1024];
172 /* Indicates whether the file name was specified on the command line */
173 bool net_boot_file_name_explicit;
174 /* The actual transferred size of the bootfile (in bytes) */
175 u32 net_boot_file_size;
176 /* Boot file size in blocks as reported by the DHCP server */
177 u32 net_boot_file_expected_size_in_blocks;
178
179 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
180 /* Receive packets */
181 uchar *net_rx_packets[PKTBUFSRX];
182 /* Current UDP RX packet handler */
183 static rxhand_f *udp_packet_handler;
184 /* Current ARP RX packet handler */
185 static rxhand_f *arp_packet_handler;
186 #ifdef CONFIG_CMD_TFTPPUT
187 /* Current ICMP rx handler */
188 static rxhand_icmp_f *packet_icmp_handler;
189 #endif
190 /* Current timeout handler */
191 static thand_f *time_handler;
192 /* Time base value */
193 static ulong time_start;
194 /* Current timeout value */
195 static ulong time_delta;
196 /* THE transmit packet */
197 uchar *net_tx_packet;
198
199 static int net_check_prereq(enum proto_t protocol);
200
201 static int net_try_count;
202
203 int __maybe_unused net_busy_flag;
204
205 /**********************************************************************/
206
on_ipaddr(const char * name,const char * value,enum env_op op,int flags)207 static int on_ipaddr(const char *name, const char *value, enum env_op op,
208 int flags)
209 {
210 if (flags & H_PROGRAMMATIC)
211 return 0;
212
213 net_ip = string_to_ip(value);
214
215 return 0;
216 }
217 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
218
on_gatewayip(const char * name,const char * value,enum env_op op,int flags)219 static int on_gatewayip(const char *name, const char *value, enum env_op op,
220 int flags)
221 {
222 if (flags & H_PROGRAMMATIC)
223 return 0;
224
225 net_gateway = string_to_ip(value);
226
227 return 0;
228 }
229 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
230
on_netmask(const char * name,const char * value,enum env_op op,int flags)231 static int on_netmask(const char *name, const char *value, enum env_op op,
232 int flags)
233 {
234 if (flags & H_PROGRAMMATIC)
235 return 0;
236
237 net_netmask = string_to_ip(value);
238
239 return 0;
240 }
241 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
242
on_serverip(const char * name,const char * value,enum env_op op,int flags)243 static int on_serverip(const char *name, const char *value, enum env_op op,
244 int flags)
245 {
246 if (flags & H_PROGRAMMATIC)
247 return 0;
248
249 net_server_ip = string_to_ip(value);
250
251 return 0;
252 }
253 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
254
on_nvlan(const char * name,const char * value,enum env_op op,int flags)255 static int on_nvlan(const char *name, const char *value, enum env_op op,
256 int flags)
257 {
258 if (flags & H_PROGRAMMATIC)
259 return 0;
260
261 net_native_vlan = string_to_vlan(value);
262
263 return 0;
264 }
265 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
266
on_vlan(const char * name,const char * value,enum env_op op,int flags)267 static int on_vlan(const char *name, const char *value, enum env_op op,
268 int flags)
269 {
270 if (flags & H_PROGRAMMATIC)
271 return 0;
272
273 net_our_vlan = string_to_vlan(value);
274
275 return 0;
276 }
277 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
278
279 #if defined(CONFIG_CMD_DNS)
on_dnsip(const char * name,const char * value,enum env_op op,int flags)280 static int on_dnsip(const char *name, const char *value, enum env_op op,
281 int flags)
282 {
283 if (flags & H_PROGRAMMATIC)
284 return 0;
285
286 net_dns_server = string_to_ip(value);
287
288 return 0;
289 }
290 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
291 #endif
292
293 /*
294 * Check if autoload is enabled. If so, use either NFS or TFTP to download
295 * the boot file.
296 */
net_auto_load(void)297 void net_auto_load(void)
298 {
299 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
300 const char *s = env_get("autoload");
301
302 if (s != NULL && strcmp(s, "NFS") == 0) {
303 if (net_check_prereq(NFS)) {
304 /* We aren't expecting to get a serverip, so just accept the assigned IP */
305 #ifdef CONFIG_BOOTP_SERVERIP
306 net_set_state(NETLOOP_SUCCESS);
307 #else
308 printf("Cannot autoload with NFS\n");
309 net_set_state(NETLOOP_FAIL);
310 #endif
311 return;
312 }
313 /*
314 * Use NFS to load the bootfile.
315 */
316 nfs_start();
317 return;
318 }
319 #endif
320 if (env_get_yesno("autoload") == 0) {
321 /*
322 * Just use BOOTP/RARP to configure system;
323 * Do not use TFTP to load the bootfile.
324 */
325 net_set_state(NETLOOP_SUCCESS);
326 return;
327 }
328 if (net_check_prereq(TFTPGET)) {
329 /* We aren't expecting to get a serverip, so just accept the assigned IP */
330 #ifdef CONFIG_BOOTP_SERVERIP
331 net_set_state(NETLOOP_SUCCESS);
332 #else
333 printf("Cannot autoload with TFTPGET\n");
334 net_set_state(NETLOOP_FAIL);
335 #endif
336 return;
337 }
338 tftp_start(TFTPGET);
339 }
340
net_init_loop(void)341 static int net_init_loop(void)
342 {
343 if (eth_get_dev())
344 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
345 else
346 /*
347 * Not ideal, but there's no way to get the actual error, and I
348 * don't feel like fixing all the users of eth_get_dev to deal
349 * with errors.
350 */
351 return -ENONET;
352
353 return 0;
354 }
355
net_clear_handlers(void)356 static void net_clear_handlers(void)
357 {
358 net_set_udp_handler(NULL);
359 net_set_arp_handler(NULL);
360 net_set_timeout_handler(0, NULL);
361 }
362
net_cleanup_loop(void)363 static void net_cleanup_loop(void)
364 {
365 net_clear_handlers();
366 }
367
net_init(void)368 int net_init(void)
369 {
370 static int first_call = 1;
371
372 if (first_call) {
373 /*
374 * Setup packet buffers, aligned correctly.
375 */
376 int i;
377
378 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
379 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
380 for (i = 0; i < PKTBUFSRX; i++) {
381 net_rx_packets[i] = net_tx_packet +
382 (i + 1) * PKTSIZE_ALIGN;
383 }
384 arp_init();
385 net_clear_handlers();
386
387 /* Only need to setup buffer pointers once. */
388 first_call = 0;
389 }
390
391 return net_init_loop();
392 }
393
394 /**********************************************************************/
395 /*
396 * Main network processing loop.
397 */
398
net_loop(enum proto_t protocol)399 int net_loop(enum proto_t protocol)
400 {
401 int ret = -EINVAL;
402 enum net_loop_state prev_net_state = net_state;
403
404 #if defined(CONFIG_CMD_PING)
405 if (protocol != PING)
406 net_ping_ip.s_addr = 0;
407 #endif
408 net_restarted = 0;
409 net_dev_exists = 0;
410 net_try_count = 1;
411 debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
412
413 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
414 net_init();
415 if (eth_is_on_demand_init()) {
416 eth_halt();
417 eth_set_current();
418 ret = eth_init();
419 if (ret < 0) {
420 eth_halt();
421 return ret;
422 }
423 } else {
424 eth_init_state_only();
425 }
426 restart:
427 #ifdef CONFIG_USB_KEYBOARD
428 net_busy_flag = 0;
429 #endif
430 net_set_state(NETLOOP_CONTINUE);
431
432 /*
433 * Start the ball rolling with the given start function. From
434 * here on, this code is a state machine driven by received
435 * packets and timer events.
436 */
437 debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
438 net_init_loop();
439
440 switch (net_check_prereq(protocol)) {
441 case 1:
442 /* network not configured */
443 eth_halt();
444 net_set_state(prev_net_state);
445 return -ENODEV;
446
447 case 2:
448 /* network device not configured */
449 break;
450
451 case 0:
452 net_dev_exists = 1;
453 net_boot_file_size = 0;
454 switch (protocol) {
455 #ifdef CONFIG_CMD_TFTPBOOT
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 #endif
464 #ifdef CONFIG_CMD_TFTPSRV
465 case TFTPSRV:
466 tftp_start_server();
467 break;
468 #endif
469 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
470 case FASTBOOT:
471 fastboot_start_server();
472 break;
473 #endif
474 #if defined(CONFIG_CMD_DHCP)
475 case DHCP:
476 bootp_reset();
477 net_ip.s_addr = 0;
478 dhcp_request(); /* Basically same as BOOTP */
479 break;
480 #endif
481 #if defined(CONFIG_CMD_BOOTP)
482 case BOOTP:
483 bootp_reset();
484 net_ip.s_addr = 0;
485 bootp_request();
486 break;
487 #endif
488 #if defined(CONFIG_CMD_RARP)
489 case RARP:
490 rarp_try = 0;
491 net_ip.s_addr = 0;
492 rarp_request();
493 break;
494 #endif
495 #if defined(CONFIG_CMD_PING)
496 case PING:
497 ping_start();
498 break;
499 #endif
500 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
501 case NFS:
502 nfs_start();
503 break;
504 #endif
505 #if defined(CONFIG_CMD_CDP)
506 case CDP:
507 cdp_start();
508 break;
509 #endif
510 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
511 case NETCONS:
512 nc_start();
513 break;
514 #endif
515 #if defined(CONFIG_CMD_DNS)
516 case DNS:
517 dns_start();
518 break;
519 #endif
520 #if defined(CONFIG_CMD_LINK_LOCAL)
521 case LINKLOCAL:
522 link_local_start();
523 break;
524 #endif
525 #if defined(CONFIG_CMD_WOL)
526 case WOL:
527 wol_start();
528 break;
529 #endif
530 default:
531 break;
532 }
533
534 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
535 udp_start();
536
537 break;
538 }
539
540 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
541 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
542 defined(CONFIG_LED_STATUS) && \
543 defined(CONFIG_LED_STATUS_RED)
544 /*
545 * Echo the inverted link state to the fault LED.
546 */
547 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
548 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
549 else
550 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
551 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
552 #endif /* CONFIG_MII, ... */
553 #ifdef CONFIG_USB_KEYBOARD
554 net_busy_flag = 1;
555 #endif
556
557 /*
558 * Main packet reception loop. Loop receiving packets until
559 * someone sets `net_state' to a state that terminates.
560 */
561 for (;;) {
562 WATCHDOG_RESET();
563 if (arp_timeout_check() > 0)
564 time_start = get_timer(0);
565
566 /*
567 * Check the ethernet for a new packet. The ethernet
568 * receive routine will process it.
569 * Most drivers return the most recent packet size, but not
570 * errors that may have happened.
571 */
572 eth_rx();
573
574 /*
575 * Abort if ctrl-c was pressed.
576 */
577 if (ctrlc()) {
578 /* cancel any ARP that may not have completed */
579 net_arp_wait_packet_ip.s_addr = 0;
580
581 net_cleanup_loop();
582 eth_halt();
583 /* Invalidate the last protocol */
584 eth_set_last_protocol(BOOTP);
585
586 puts("\nAbort\n");
587 /* include a debug print as well incase the debug
588 messages are directed to stderr */
589 debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
590 ret = -EINTR;
591 goto done;
592 }
593
594 /*
595 * Check for a timeout, and run the timeout handler
596 * if we have one.
597 */
598 if (time_handler &&
599 ((get_timer(0) - time_start) > time_delta)) {
600 thand_f *x;
601
602 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
603 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
604 defined(CONFIG_LED_STATUS) && \
605 defined(CONFIG_LED_STATUS_RED)
606 /*
607 * Echo the inverted link state to the fault LED.
608 */
609 if (miiphy_link(eth_get_dev()->name,
610 CONFIG_SYS_FAULT_MII_ADDR))
611 status_led_set(CONFIG_LED_STATUS_RED,
612 CONFIG_LED_STATUS_OFF);
613 else
614 status_led_set(CONFIG_LED_STATUS_RED,
615 CONFIG_LED_STATUS_ON);
616 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
617 #endif /* CONFIG_MII, ... */
618 debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
619 x = time_handler;
620 time_handler = (thand_f *)0;
621 (*x)();
622 }
623
624 if (net_state == NETLOOP_FAIL)
625 ret = net_start_again();
626
627 switch (net_state) {
628 case NETLOOP_RESTART:
629 net_restarted = 1;
630 goto restart;
631
632 case NETLOOP_SUCCESS:
633 net_cleanup_loop();
634 if (net_boot_file_size > 0) {
635 printf("Bytes transferred = %d (%x hex)\n",
636 net_boot_file_size, net_boot_file_size);
637 env_set_hex("filesize", net_boot_file_size);
638 env_set_hex("fileaddr", image_load_addr);
639 }
640 if (protocol != NETCONS)
641 eth_halt();
642 else
643 eth_halt_state_only();
644
645 eth_set_last_protocol(protocol);
646
647 ret = net_boot_file_size;
648 debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
649 goto done;
650
651 case NETLOOP_FAIL:
652 net_cleanup_loop();
653 /* Invalidate the last protocol */
654 eth_set_last_protocol(BOOTP);
655 debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
656 ret = -ENONET;
657 goto done;
658
659 case NETLOOP_CONTINUE:
660 continue;
661 }
662 }
663
664 done:
665 #ifdef CONFIG_USB_KEYBOARD
666 net_busy_flag = 0;
667 #endif
668 #ifdef CONFIG_CMD_TFTPPUT
669 /* Clear out the handlers */
670 net_set_udp_handler(NULL);
671 net_set_icmp_handler(NULL);
672 #endif
673 net_set_state(prev_net_state);
674
675 #if defined(CONFIG_CMD_PCAP)
676 if (pcap_active())
677 pcap_print_status();
678 #endif
679 return ret;
680 }
681
682 /**********************************************************************/
683
start_again_timeout_handler(void)684 static void start_again_timeout_handler(void)
685 {
686 net_set_state(NETLOOP_RESTART);
687 }
688
net_start_again(void)689 int net_start_again(void)
690 {
691 char *nretry;
692 int retry_forever = 0;
693 unsigned long retrycnt = 0;
694 int ret;
695
696 nretry = env_get("netretry");
697 if (nretry) {
698 if (!strcmp(nretry, "yes"))
699 retry_forever = 1;
700 else if (!strcmp(nretry, "no"))
701 retrycnt = 0;
702 else if (!strcmp(nretry, "once"))
703 retrycnt = 1;
704 else
705 retrycnt = simple_strtoul(nretry, NULL, 0);
706 } else {
707 retrycnt = 0;
708 retry_forever = 0;
709 }
710
711 if ((!retry_forever) && (net_try_count > retrycnt)) {
712 eth_halt();
713 net_set_state(NETLOOP_FAIL);
714 /*
715 * We don't provide a way for the protocol to return an error,
716 * but this is almost always the reason.
717 */
718 return -ETIMEDOUT;
719 }
720
721 net_try_count++;
722
723 eth_halt();
724 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
725 eth_try_another(!net_restarted);
726 #endif
727 ret = eth_init();
728 if (net_restart_wrap) {
729 net_restart_wrap = 0;
730 if (net_dev_exists) {
731 net_set_timeout_handler(10000UL,
732 start_again_timeout_handler);
733 net_set_udp_handler(NULL);
734 } else {
735 net_set_state(NETLOOP_FAIL);
736 }
737 } else {
738 net_set_state(NETLOOP_RESTART);
739 }
740 return ret;
741 }
742
743 /**********************************************************************/
744 /*
745 * Miscelaneous bits.
746 */
747
dummy_handler(uchar * pkt,unsigned dport,struct in_addr sip,unsigned sport,unsigned len)748 static void dummy_handler(uchar *pkt, unsigned dport,
749 struct in_addr sip, unsigned sport,
750 unsigned len)
751 {
752 }
753
net_get_udp_handler(void)754 rxhand_f *net_get_udp_handler(void)
755 {
756 return udp_packet_handler;
757 }
758
net_set_udp_handler(rxhand_f * f)759 void net_set_udp_handler(rxhand_f *f)
760 {
761 debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
762 if (f == NULL)
763 udp_packet_handler = dummy_handler;
764 else
765 udp_packet_handler = f;
766 }
767
net_get_arp_handler(void)768 rxhand_f *net_get_arp_handler(void)
769 {
770 return arp_packet_handler;
771 }
772
net_set_arp_handler(rxhand_f * f)773 void net_set_arp_handler(rxhand_f *f)
774 {
775 debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
776 if (f == NULL)
777 arp_packet_handler = dummy_handler;
778 else
779 arp_packet_handler = f;
780 }
781
782 #ifdef CONFIG_CMD_TFTPPUT
net_set_icmp_handler(rxhand_icmp_f * f)783 void net_set_icmp_handler(rxhand_icmp_f *f)
784 {
785 packet_icmp_handler = f;
786 }
787 #endif
788
net_set_timeout_handler(ulong iv,thand_f * f)789 void net_set_timeout_handler(ulong iv, thand_f *f)
790 {
791 if (iv == 0) {
792 debug_cond(DEBUG_INT_STATE,
793 "--- net_loop timeout handler cancelled\n");
794 time_handler = (thand_f *)0;
795 } else {
796 debug_cond(DEBUG_INT_STATE,
797 "--- net_loop timeout handler set (%p)\n", f);
798 time_handler = f;
799 time_start = get_timer(0);
800 time_delta = iv * CONFIG_SYS_HZ / 1000;
801 }
802 }
803
net_get_async_tx_pkt_buf(void)804 uchar *net_get_async_tx_pkt_buf(void)
805 {
806 if (arp_is_waiting())
807 return arp_tx_packet; /* If we are waiting, we already sent */
808 else
809 return net_tx_packet;
810 }
811
net_send_udp_packet(uchar * ether,struct in_addr dest,int dport,int sport,int payload_len)812 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
813 int payload_len)
814 {
815 return net_send_ip_packet(ether, dest, dport, sport, payload_len,
816 IPPROTO_UDP, 0, 0, 0);
817 }
818
net_send_ip_packet(uchar * ether,struct in_addr dest,int dport,int sport,int payload_len,int proto,u8 action,u32 tcp_seq_num,u32 tcp_ack_num)819 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
820 int payload_len, int proto, u8 action, u32 tcp_seq_num,
821 u32 tcp_ack_num)
822 {
823 uchar *pkt;
824 int eth_hdr_size;
825 int pkt_hdr_size;
826
827 /* make sure the net_tx_packet is initialized (net_init() was called) */
828 assert(net_tx_packet != NULL);
829 if (net_tx_packet == NULL)
830 return -1;
831
832 /* convert to new style broadcast */
833 if (dest.s_addr == 0)
834 dest.s_addr = 0xFFFFFFFF;
835
836 /* if broadcast, make the ether address a broadcast and don't do ARP */
837 if (dest.s_addr == 0xFFFFFFFF)
838 ether = (uchar *)net_bcast_ethaddr;
839
840 pkt = (uchar *)net_tx_packet;
841
842 eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
843
844 switch (proto) {
845 case IPPROTO_UDP:
846 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
847 payload_len);
848 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
849 break;
850 default:
851 return -EINVAL;
852 }
853
854 /* if MAC address was not discovered yet, do an ARP request */
855 if (memcmp(ether, net_null_ethaddr, 6) == 0) {
856 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
857
858 /* save the ip and eth addr for the packet to send after arp */
859 net_arp_wait_packet_ip = dest;
860 arp_wait_packet_ethaddr = ether;
861
862 /* size of the waiting packet */
863 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
864
865 /* and do the ARP request */
866 arp_wait_try = 1;
867 arp_wait_timer_start = get_timer(0);
868 arp_request();
869 return 1; /* waiting */
870 } else {
871 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
872 &dest, ether);
873 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
874 return 0; /* transmitted */
875 }
876 }
877
878 #ifdef CONFIG_IP_DEFRAG
879 /*
880 * This function collects fragments in a single packet, according
881 * to the algorithm in RFC815. It returns NULL or the pointer to
882 * a complete packet, in static storage
883 */
884 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
885
886 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
887
888 /*
889 * this is the packet being assembled, either data or frag control.
890 * Fragments go by 8 bytes, so this union must be 8 bytes long
891 */
892 struct hole {
893 /* first_byte is address of this structure */
894 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
895 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
896 u16 prev_hole; /* index of prev, 0 == none */
897 u16 unused;
898 };
899
__net_defragment(struct ip_udp_hdr * ip,int * lenp)900 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
901 {
902 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
903 static u16 first_hole, total_len;
904 struct hole *payload, *thisfrag, *h, *newh;
905 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
906 uchar *indata = (uchar *)ip;
907 int offset8, start, len, done = 0;
908 u16 ip_off = ntohs(ip->ip_off);
909
910 /* payload starts after IP header, this fragment is in there */
911 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
912 offset8 = (ip_off & IP_OFFS);
913 thisfrag = payload + offset8;
914 start = offset8 * 8;
915 len = ntohs(ip->ip_len) - IP_HDR_SIZE;
916
917 if (start + len > IP_MAXUDP) /* fragment extends too far */
918 return NULL;
919
920 if (!total_len || localip->ip_id != ip->ip_id) {
921 /* new (or different) packet, reset structs */
922 total_len = 0xffff;
923 payload[0].last_byte = ~0;
924 payload[0].next_hole = 0;
925 payload[0].prev_hole = 0;
926 first_hole = 0;
927 /* any IP header will work, copy the first we received */
928 memcpy(localip, ip, IP_HDR_SIZE);
929 }
930
931 /*
932 * What follows is the reassembly algorithm. We use the payload
933 * array as a linked list of hole descriptors, as each hole starts
934 * at a multiple of 8 bytes. However, last byte can be whatever value,
935 * so it is represented as byte count, not as 8-byte blocks.
936 */
937
938 h = payload + first_hole;
939 while (h->last_byte < start) {
940 if (!h->next_hole) {
941 /* no hole that far away */
942 return NULL;
943 }
944 h = payload + h->next_hole;
945 }
946
947 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
948 if (offset8 + ((len + 7) / 8) <= h - payload) {
949 /* no overlap with holes (dup fragment?) */
950 return NULL;
951 }
952
953 if (!(ip_off & IP_FLAGS_MFRAG)) {
954 /* no more fragmentss: truncate this (last) hole */
955 total_len = start + len;
956 h->last_byte = start + len;
957 }
958
959 /*
960 * There is some overlap: fix the hole list. This code doesn't
961 * deal with a fragment that overlaps with two different holes
962 * (thus being a superset of a previously-received fragment).
963 */
964
965 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
966 /* complete overlap with hole: remove hole */
967 if (!h->prev_hole && !h->next_hole) {
968 /* last remaining hole */
969 done = 1;
970 } else if (!h->prev_hole) {
971 /* first hole */
972 first_hole = h->next_hole;
973 payload[h->next_hole].prev_hole = 0;
974 } else if (!h->next_hole) {
975 /* last hole */
976 payload[h->prev_hole].next_hole = 0;
977 } else {
978 /* in the middle of the list */
979 payload[h->next_hole].prev_hole = h->prev_hole;
980 payload[h->prev_hole].next_hole = h->next_hole;
981 }
982
983 } else if (h->last_byte <= start + len) {
984 /* overlaps with final part of the hole: shorten this hole */
985 h->last_byte = start;
986
987 } else if (h >= thisfrag) {
988 /* overlaps with initial part of the hole: move this hole */
989 newh = thisfrag + (len / 8);
990 *newh = *h;
991 h = newh;
992 if (h->next_hole)
993 payload[h->next_hole].prev_hole = (h - payload);
994 if (h->prev_hole)
995 payload[h->prev_hole].next_hole = (h - payload);
996 else
997 first_hole = (h - payload);
998
999 } else {
1000 /* fragment sits in the middle: split the hole */
1001 newh = thisfrag + (len / 8);
1002 *newh = *h;
1003 h->last_byte = start;
1004 h->next_hole = (newh - payload);
1005 newh->prev_hole = (h - payload);
1006 if (newh->next_hole)
1007 payload[newh->next_hole].prev_hole = (newh - payload);
1008 }
1009
1010 /* finally copy this fragment and possibly return whole packet */
1011 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1012 if (!done)
1013 return NULL;
1014
1015 localip->ip_len = htons(total_len);
1016 *lenp = total_len + IP_HDR_SIZE;
1017 return localip;
1018 }
1019
net_defragment(struct ip_udp_hdr * ip,int * lenp)1020 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1021 int *lenp)
1022 {
1023 u16 ip_off = ntohs(ip->ip_off);
1024 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1025 return ip; /* not a fragment */
1026 return __net_defragment(ip, lenp);
1027 }
1028
1029 #else /* !CONFIG_IP_DEFRAG */
1030
net_defragment(struct ip_udp_hdr * ip,int * lenp)1031 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1032 int *lenp)
1033 {
1034 u16 ip_off = ntohs(ip->ip_off);
1035 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1036 return ip; /* not a fragment */
1037 return NULL;
1038 }
1039 #endif
1040
1041 /**
1042 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1043 * drop others.
1044 *
1045 * @parma ip IP packet containing the ICMP
1046 */
receive_icmp(struct ip_udp_hdr * ip,int len,struct in_addr src_ip,struct ethernet_hdr * et)1047 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1048 struct in_addr src_ip, struct ethernet_hdr *et)
1049 {
1050 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1051
1052 switch (icmph->type) {
1053 case ICMP_REDIRECT:
1054 if (icmph->code != ICMP_REDIR_HOST)
1055 return;
1056 printf(" ICMP Host Redirect to %pI4 ",
1057 &icmph->un.gateway);
1058 break;
1059 default:
1060 #if defined(CONFIG_CMD_PING)
1061 ping_receive(et, ip, len);
1062 #endif
1063 #ifdef CONFIG_CMD_TFTPPUT
1064 if (packet_icmp_handler)
1065 packet_icmp_handler(icmph->type, icmph->code,
1066 ntohs(ip->udp_dst), src_ip,
1067 ntohs(ip->udp_src), icmph->un.data,
1068 ntohs(ip->udp_len));
1069 #endif
1070 break;
1071 }
1072 }
1073
net_process_received_packet(uchar * in_packet,int len)1074 void net_process_received_packet(uchar *in_packet, int len)
1075 {
1076 struct ethernet_hdr *et;
1077 struct ip_udp_hdr *ip;
1078 struct in_addr dst_ip;
1079 struct in_addr src_ip;
1080 int eth_proto;
1081 #if defined(CONFIG_CMD_CDP)
1082 int iscdp;
1083 #endif
1084 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1085
1086 debug_cond(DEBUG_NET_PKT, "packet received\n");
1087
1088 #if defined(CONFIG_CMD_PCAP)
1089 pcap_post(in_packet, len, false);
1090 #endif
1091 net_rx_packet = in_packet;
1092 net_rx_packet_len = len;
1093 et = (struct ethernet_hdr *)in_packet;
1094
1095 /* too small packet? */
1096 if (len < ETHER_HDR_SIZE)
1097 return;
1098
1099 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1100 if (push_packet) {
1101 (*push_packet)(in_packet, len);
1102 return;
1103 }
1104 #endif
1105
1106 #if defined(CONFIG_CMD_CDP)
1107 /* keep track if packet is CDP */
1108 iscdp = is_cdp_packet(et->et_dest);
1109 #endif
1110
1111 myvlanid = ntohs(net_our_vlan);
1112 if (myvlanid == (ushort)-1)
1113 myvlanid = VLAN_NONE;
1114 mynvlanid = ntohs(net_native_vlan);
1115 if (mynvlanid == (ushort)-1)
1116 mynvlanid = VLAN_NONE;
1117
1118 eth_proto = ntohs(et->et_protlen);
1119
1120 if (eth_proto < 1514) {
1121 struct e802_hdr *et802 = (struct e802_hdr *)et;
1122 /*
1123 * Got a 802.2 packet. Check the other protocol field.
1124 * XXX VLAN over 802.2+SNAP not implemented!
1125 */
1126 eth_proto = ntohs(et802->et_prot);
1127
1128 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1129 len -= E802_HDR_SIZE;
1130
1131 } else if (eth_proto != PROT_VLAN) { /* normal packet */
1132 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1133 len -= ETHER_HDR_SIZE;
1134
1135 } else { /* VLAN packet */
1136 struct vlan_ethernet_hdr *vet =
1137 (struct vlan_ethernet_hdr *)et;
1138
1139 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1140
1141 /* too small packet? */
1142 if (len < VLAN_ETHER_HDR_SIZE)
1143 return;
1144
1145 /* if no VLAN active */
1146 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1147 #if defined(CONFIG_CMD_CDP)
1148 && iscdp == 0
1149 #endif
1150 )
1151 return;
1152
1153 cti = ntohs(vet->vet_tag);
1154 vlanid = cti & VLAN_IDMASK;
1155 eth_proto = ntohs(vet->vet_type);
1156
1157 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1158 len -= VLAN_ETHER_HDR_SIZE;
1159 }
1160
1161 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1162
1163 #if defined(CONFIG_CMD_CDP)
1164 if (iscdp) {
1165 cdp_receive((uchar *)ip, len);
1166 return;
1167 }
1168 #endif
1169
1170 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1171 if (vlanid == VLAN_NONE)
1172 vlanid = (mynvlanid & VLAN_IDMASK);
1173 /* not matched? */
1174 if (vlanid != (myvlanid & VLAN_IDMASK))
1175 return;
1176 }
1177
1178 switch (eth_proto) {
1179 case PROT_ARP:
1180 arp_receive(et, ip, len);
1181 break;
1182
1183 #ifdef CONFIG_CMD_RARP
1184 case PROT_RARP:
1185 rarp_receive(ip, len);
1186 break;
1187 #endif
1188 case PROT_IP:
1189 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1190 /* Before we start poking the header, make sure it is there */
1191 if (len < IP_UDP_HDR_SIZE) {
1192 debug("len bad %d < %lu\n", len,
1193 (ulong)IP_UDP_HDR_SIZE);
1194 return;
1195 }
1196 /* Check the packet length */
1197 if (len < ntohs(ip->ip_len)) {
1198 debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1199 return;
1200 }
1201 len = ntohs(ip->ip_len);
1202 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1203 len, ip->ip_hl_v & 0xff);
1204
1205 /* Can't deal with anything except IPv4 */
1206 if ((ip->ip_hl_v & 0xf0) != 0x40)
1207 return;
1208 /* Can't deal with IP options (headers != 20 bytes) */
1209 if ((ip->ip_hl_v & 0x0f) > 0x05)
1210 return;
1211 /* Check the Checksum of the header */
1212 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1213 debug("checksum bad\n");
1214 return;
1215 }
1216 /* If it is not for us, ignore it */
1217 dst_ip = net_read_ip(&ip->ip_dst);
1218 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1219 dst_ip.s_addr != 0xFFFFFFFF) {
1220 return;
1221 }
1222 /* Read source IP address for later use */
1223 src_ip = net_read_ip(&ip->ip_src);
1224 /*
1225 * The function returns the unchanged packet if it's not
1226 * a fragment, and either the complete packet or NULL if
1227 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1228 */
1229 ip = net_defragment(ip, &len);
1230 if (!ip)
1231 return;
1232 /*
1233 * watch for ICMP host redirects
1234 *
1235 * There is no real handler code (yet). We just watch
1236 * for ICMP host redirect messages. In case anybody
1237 * sees these messages: please contact me
1238 * (wd@denx.de), or - even better - send me the
1239 * necessary fixes :-)
1240 *
1241 * Note: in all cases where I have seen this so far
1242 * it was a problem with the router configuration,
1243 * for instance when a router was configured in the
1244 * BOOTP reply, but the TFTP server was on the same
1245 * subnet. So this is probably a warning that your
1246 * configuration might be wrong. But I'm not really
1247 * sure if there aren't any other situations.
1248 *
1249 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1250 * we send a tftp packet to a dead connection, or when
1251 * there is no server at the other end.
1252 */
1253 if (ip->ip_p == IPPROTO_ICMP) {
1254 receive_icmp(ip, len, src_ip, et);
1255 return;
1256 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1257 return;
1258 }
1259
1260 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len))
1261 return;
1262
1263 debug_cond(DEBUG_DEV_PKT,
1264 "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1265 &dst_ip, &src_ip, len);
1266
1267 #ifdef CONFIG_UDP_CHECKSUM
1268 if (ip->udp_xsum != 0) {
1269 ulong xsum;
1270 u8 *sumptr;
1271 ushort sumlen;
1272
1273 xsum = ip->ip_p;
1274 xsum += (ntohs(ip->udp_len));
1275 xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1276 xsum += (ntohl(ip->ip_src.s_addr) >> 0) & 0x0000ffff;
1277 xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1278 xsum += (ntohl(ip->ip_dst.s_addr) >> 0) & 0x0000ffff;
1279
1280 sumlen = ntohs(ip->udp_len);
1281 sumptr = (u8 *)&ip->udp_src;
1282
1283 while (sumlen > 1) {
1284 /* inlined ntohs() to avoid alignment errors */
1285 xsum += (sumptr[0] << 8) + sumptr[1];
1286 sumptr += 2;
1287 sumlen -= 2;
1288 }
1289 if (sumlen > 0)
1290 xsum += (sumptr[0] << 8) + sumptr[0];
1291 while ((xsum >> 16) != 0) {
1292 xsum = (xsum & 0x0000ffff) +
1293 ((xsum >> 16) & 0x0000ffff);
1294 }
1295 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1296 printf(" UDP wrong checksum %08lx %08x\n",
1297 xsum, ntohs(ip->udp_xsum));
1298 return;
1299 }
1300 }
1301 #endif
1302
1303 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1304 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1305 src_ip,
1306 ntohs(ip->udp_dst),
1307 ntohs(ip->udp_src),
1308 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1309 #endif
1310 /*
1311 * IP header OK. Pass the packet to the current handler.
1312 */
1313 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1314 ntohs(ip->udp_dst),
1315 src_ip,
1316 ntohs(ip->udp_src),
1317 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1318 break;
1319 #ifdef CONFIG_CMD_WOL
1320 case PROT_WOL:
1321 wol_receive(ip, len);
1322 break;
1323 #endif
1324 }
1325 }
1326
1327 /**********************************************************************/
1328
net_check_prereq(enum proto_t protocol)1329 static int net_check_prereq(enum proto_t protocol)
1330 {
1331 switch (protocol) {
1332 /* Fall through */
1333 #if defined(CONFIG_CMD_PING)
1334 case PING:
1335 if (net_ping_ip.s_addr == 0) {
1336 puts("*** ERROR: ping address not given\n");
1337 return 1;
1338 }
1339 goto common;
1340 #endif
1341 #if defined(CONFIG_CMD_DNS)
1342 case DNS:
1343 if (net_dns_server.s_addr == 0) {
1344 puts("*** ERROR: DNS server address not given\n");
1345 return 1;
1346 }
1347 goto common;
1348 #endif
1349 #if defined(CONFIG_PROT_UDP)
1350 case UDP:
1351 if (udp_prereq())
1352 return 1;
1353 goto common;
1354 #endif
1355
1356 #if defined(CONFIG_CMD_NFS)
1357 case NFS:
1358 #endif
1359 /* Fall through */
1360 case TFTPGET:
1361 case TFTPPUT:
1362 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1363 puts("*** ERROR: `serverip' not set\n");
1364 return 1;
1365 }
1366 #if defined(CONFIG_CMD_PING) || \
1367 defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1368 common:
1369 #endif
1370 /* Fall through */
1371
1372 case NETCONS:
1373 case FASTBOOT:
1374 case TFTPSRV:
1375 if (net_ip.s_addr == 0) {
1376 puts("*** ERROR: `ipaddr' not set\n");
1377 return 1;
1378 }
1379 /* Fall through */
1380
1381 #ifdef CONFIG_CMD_RARP
1382 case RARP:
1383 #endif
1384 case BOOTP:
1385 case CDP:
1386 case DHCP:
1387 case LINKLOCAL:
1388 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1389 int num = eth_get_dev_index();
1390
1391 switch (num) {
1392 case -1:
1393 puts("*** ERROR: No ethernet found.\n");
1394 return 1;
1395 case 0:
1396 puts("*** ERROR: `ethaddr' not set\n");
1397 break;
1398 default:
1399 printf("*** ERROR: `eth%daddr' not set\n",
1400 num);
1401 break;
1402 }
1403
1404 net_start_again();
1405 return 2;
1406 }
1407 /* Fall through */
1408 default:
1409 return 0;
1410 }
1411 return 0; /* OK */
1412 }
1413 /**********************************************************************/
1414
1415 int
net_eth_hdr_size(void)1416 net_eth_hdr_size(void)
1417 {
1418 ushort myvlanid;
1419
1420 myvlanid = ntohs(net_our_vlan);
1421 if (myvlanid == (ushort)-1)
1422 myvlanid = VLAN_NONE;
1423
1424 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1425 VLAN_ETHER_HDR_SIZE;
1426 }
1427
net_set_ether(uchar * xet,const uchar * dest_ethaddr,uint prot)1428 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1429 {
1430 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1431 ushort myvlanid;
1432
1433 myvlanid = ntohs(net_our_vlan);
1434 if (myvlanid == (ushort)-1)
1435 myvlanid = VLAN_NONE;
1436
1437 memcpy(et->et_dest, dest_ethaddr, 6);
1438 memcpy(et->et_src, net_ethaddr, 6);
1439 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1440 et->et_protlen = htons(prot);
1441 return ETHER_HDR_SIZE;
1442 } else {
1443 struct vlan_ethernet_hdr *vet =
1444 (struct vlan_ethernet_hdr *)xet;
1445
1446 vet->vet_vlan_type = htons(PROT_VLAN);
1447 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1448 vet->vet_type = htons(prot);
1449 return VLAN_ETHER_HDR_SIZE;
1450 }
1451 }
1452
net_update_ether(struct ethernet_hdr * et,uchar * addr,uint prot)1453 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1454 {
1455 ushort protlen;
1456
1457 memcpy(et->et_dest, addr, 6);
1458 memcpy(et->et_src, net_ethaddr, 6);
1459 protlen = ntohs(et->et_protlen);
1460 if (protlen == PROT_VLAN) {
1461 struct vlan_ethernet_hdr *vet =
1462 (struct vlan_ethernet_hdr *)et;
1463 vet->vet_type = htons(prot);
1464 return VLAN_ETHER_HDR_SIZE;
1465 } else if (protlen > 1514) {
1466 et->et_protlen = htons(prot);
1467 return ETHER_HDR_SIZE;
1468 } else {
1469 /* 802.2 + SNAP */
1470 struct e802_hdr *et802 = (struct e802_hdr *)et;
1471 et802->et_prot = htons(prot);
1472 return E802_HDR_SIZE;
1473 }
1474 }
1475
net_set_ip_header(uchar * pkt,struct in_addr dest,struct in_addr source,u16 pkt_len,u8 proto)1476 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1477 u16 pkt_len, u8 proto)
1478 {
1479 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1480
1481 /*
1482 * Construct an IP header.
1483 */
1484 /* IP_HDR_SIZE / 4 (not including UDP) */
1485 ip->ip_hl_v = 0x45;
1486 ip->ip_tos = 0;
1487 ip->ip_len = htons(pkt_len);
1488 ip->ip_p = proto;
1489 ip->ip_id = htons(net_ip_id++);
1490 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1491 ip->ip_ttl = 255;
1492 ip->ip_sum = 0;
1493 /* already in network byte order */
1494 net_copy_ip((void *)&ip->ip_src, &source);
1495 /* already in network byte order */
1496 net_copy_ip((void *)&ip->ip_dst, &dest);
1497
1498 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
1499 }
1500
net_set_udp_header(uchar * pkt,struct in_addr dest,int dport,int sport,int len)1501 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1502 int len)
1503 {
1504 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1505
1506 /*
1507 * If the data is an odd number of bytes, zero the
1508 * byte after the last byte so that the checksum
1509 * will work.
1510 */
1511 if (len & 1)
1512 pkt[IP_UDP_HDR_SIZE + len] = 0;
1513
1514 net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1515 IPPROTO_UDP);
1516
1517 ip->udp_src = htons(sport);
1518 ip->udp_dst = htons(dport);
1519 ip->udp_len = htons(UDP_HDR_SIZE + len);
1520 ip->udp_xsum = 0;
1521 }
1522
copy_filename(char * dst,const char * src,int size)1523 void copy_filename(char *dst, const char *src, int size)
1524 {
1525 if (src && *src && (*src == '"')) {
1526 ++src;
1527 --size;
1528 }
1529
1530 while ((--size > 0) && src && *src && (*src != '"'))
1531 *dst++ = *src++;
1532 *dst = '\0';
1533 }
1534
is_serverip_in_cmd(void)1535 int is_serverip_in_cmd(void)
1536 {
1537 return !!strchr(net_boot_file_name, ':');
1538 }
1539
net_parse_bootfile(struct in_addr * ipaddr,char * filename,int max_len)1540 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1541 {
1542 char *colon;
1543
1544 if (net_boot_file_name[0] == '\0')
1545 return 0;
1546
1547 colon = strchr(net_boot_file_name, ':');
1548 if (colon) {
1549 if (ipaddr)
1550 *ipaddr = string_to_ip(net_boot_file_name);
1551 strncpy(filename, colon + 1, max_len);
1552 } else {
1553 strncpy(filename, net_boot_file_name, max_len);
1554 }
1555 filename[max_len - 1] = '\0';
1556
1557 return 1;
1558 }
1559
ip_to_string(struct in_addr x,char * s)1560 void ip_to_string(struct in_addr x, char *s)
1561 {
1562 x.s_addr = ntohl(x.s_addr);
1563 sprintf(s, "%d.%d.%d.%d",
1564 (int) ((x.s_addr >> 24) & 0xff),
1565 (int) ((x.s_addr >> 16) & 0xff),
1566 (int) ((x.s_addr >> 8) & 0xff),
1567 (int) ((x.s_addr >> 0) & 0xff)
1568 );
1569 }
1570
vlan_to_string(ushort x,char * s)1571 void vlan_to_string(ushort x, char *s)
1572 {
1573 x = ntohs(x);
1574
1575 if (x == (ushort)-1)
1576 x = VLAN_NONE;
1577
1578 if (x == VLAN_NONE)
1579 strcpy(s, "none");
1580 else
1581 sprintf(s, "%d", x & VLAN_IDMASK);
1582 }
1583
string_to_vlan(const char * s)1584 ushort string_to_vlan(const char *s)
1585 {
1586 ushort id;
1587
1588 if (s == NULL)
1589 return htons(VLAN_NONE);
1590
1591 if (*s < '0' || *s > '9')
1592 id = VLAN_NONE;
1593 else
1594 id = (ushort)simple_strtoul(s, NULL, 10);
1595
1596 return htons(id);
1597 }
1598
env_get_vlan(char * var)1599 ushort env_get_vlan(char *var)
1600 {
1601 return string_to_vlan(env_get(var));
1602 }
1603