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