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[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 */
10
11 /*
12 * General Desription:
13 *
14 * The user interface supports commands for BOOTP, RARP, and TFTP.
15 * Also, we support ARP internally. Depending on available data,
16 * these interact as follows:
17 *
18 * BOOTP:
19 *
20 * Prerequisites: - own ethernet address
21 * We want: - own IP address
22 * - TFTP server IP address
23 * - name of bootfile
24 * Next step: ARP
25 *
26 * LINK_LOCAL:
27 *
28 * Prerequisites: - own ethernet address
29 * We want: - own IP address
30 * Next step: ARP
31 *
32 * RARP:
33 *
34 * Prerequisites: - own ethernet address
35 * We want: - own IP address
36 * - TFTP server IP address
37 * Next step: ARP
38 *
39 * ARP:
40 *
41 * Prerequisites: - own ethernet address
42 * - own IP address
43 * - TFTP server IP address
44 * We want: - TFTP server ethernet address
45 * Next step: TFTP
46 *
47 * DHCP:
48 *
49 * Prerequisites: - own ethernet address
50 * We want: - IP, Netmask, ServerIP, Gateway IP
51 * - bootfilename, lease time
52 * Next step: - TFTP
53 *
54 * TFTP:
55 *
56 * Prerequisites: - own ethernet address
57 * - own IP address
58 * - TFTP server IP address
59 * - TFTP server ethernet address
60 * - name of bootfile (if unknown, we use a default name
61 * derived from our own IP address)
62 * We want: - load the boot file
63 * Next step: none
64 *
65 * NFS:
66 *
67 * Prerequisites: - own ethernet address
68 * - own IP address
69 * - name of bootfile (if unknown, we use a default name
70 * derived from our own IP address)
71 * We want: - load the boot file
72 * Next step: none
73 *
74 * SNTP:
75 *
76 * Prerequisites: - own ethernet address
77 * - own IP address
78 * We want: - network time
79 * Next step: none
80 */
81
82
83 #include <common.h>
84 #include <command.h>
85 #include <environment.h>
86 #include <net.h>
87 #if defined(CONFIG_STATUS_LED)
88 #include <miiphy.h>
89 #include <status_led.h>
90 #endif
91 #include <watchdog.h>
92 #include <linux/compiler.h>
93 #include "arp.h"
94 #include "bootp.h"
95 #include "cdp.h"
96 #if defined(CONFIG_CMD_DNS)
97 #include "dns.h"
98 #endif
99 #include "link_local.h"
100 #include "nfs.h"
101 #include "ping.h"
102 #include "rarp.h"
103 #if defined(CONFIG_CMD_SNTP)
104 #include "sntp.h"
105 #endif
106 #include "tftp.h"
107
108 DECLARE_GLOBAL_DATA_PTR;
109
110 /** BOOTP EXTENTIONS **/
111
112 /* Our subnet mask (0=unknown) */
113 IPaddr_t NetOurSubnetMask;
114 /* Our gateways IP address */
115 IPaddr_t NetOurGatewayIP;
116 /* Our DNS IP address */
117 IPaddr_t NetOurDNSIP;
118 #if defined(CONFIG_BOOTP_DNS2)
119 /* Our 2nd DNS IP address */
120 IPaddr_t NetOurDNS2IP;
121 #endif
122 /* Our NIS domain */
123 char NetOurNISDomain[32] = {0,};
124 /* Our hostname */
125 char NetOurHostName[32] = {0,};
126 /* Our bootpath */
127 char NetOurRootPath[64] = {0,};
128 /* Our bootfile size in blocks */
129 ushort NetBootFileSize;
130
131 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
132 IPaddr_t Mcast_addr;
133 #endif
134
135 /** END OF BOOTP EXTENTIONS **/
136
137 /* The actual transferred size of the bootfile (in bytes) */
138 ulong NetBootFileXferSize;
139 /* Our ethernet address */
140 uchar NetOurEther[6];
141 /* Boot server enet address */
142 uchar NetServerEther[6];
143 /* Our IP addr (0 = unknown) */
144 IPaddr_t NetOurIP;
145 /* Server IP addr (0 = unknown) */
146 IPaddr_t NetServerIP;
147 /* Current receive packet */
148 uchar *NetRxPacket;
149 /* Current rx packet length */
150 int NetRxPacketLen;
151 /* IP packet ID */
152 unsigned NetIPID;
153 /* Ethernet bcast address */
154 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
155 uchar NetEtherNullAddr[6];
156 #ifdef CONFIG_API
157 void (*push_packet)(void *, int len) = 0;
158 #endif
159 /* Network loop state */
160 enum net_loop_state net_state;
161 /* Tried all network devices */
162 int NetRestartWrap;
163 /* Network loop restarted */
164 static int NetRestarted;
165 /* At least one device configured */
166 static int NetDevExists;
167
168 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
169 /* default is without VLAN */
170 ushort NetOurVLAN = 0xFFFF;
171 /* ditto */
172 ushort NetOurNativeVLAN = 0xFFFF;
173
174 /* Boot File name */
175 char BootFile[128];
176
177 #if defined(CONFIG_CMD_SNTP)
178 /* NTP server IP address */
179 IPaddr_t NetNtpServerIP;
180 /* offset time from UTC */
181 int NetTimeOffset;
182 #endif
183
184 static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
185
186 /* Receive packet */
187 uchar *NetRxPackets[PKTBUFSRX];
188
189 /* Current UDP RX packet handler */
190 static rxhand_f *udp_packet_handler;
191 /* Current ARP RX packet handler */
192 static rxhand_f *arp_packet_handler;
193 #ifdef CONFIG_CMD_TFTPPUT
194 /* Current ICMP rx handler */
195 static rxhand_icmp_f *packet_icmp_handler;
196 #endif
197 /* Current timeout handler */
198 static thand_f *timeHandler;
199 /* Time base value */
200 static ulong timeStart;
201 /* Current timeout value */
202 static ulong timeDelta;
203 /* THE transmit packet */
204 uchar *NetTxPacket;
205
206 static int net_check_prereq(enum proto_t protocol);
207
208 static int NetTryCount;
209
210 /**********************************************************************/
211
212 static int on_bootfile(const char *name, const char *value, enum env_op op,
213 int flags)
214 {
215 switch (op) {
216 case env_op_create:
217 case env_op_overwrite:
218 copy_filename(BootFile, value, sizeof(BootFile));
219 break;
220 default:
221 break;
222 }
223
224 return 0;
225 }
226 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
227
228 /*
229 * Check if autoload is enabled. If so, use either NFS or TFTP to download
230 * the boot file.
231 */
232 void net_auto_load(void)
233 {
234 #if defined(CONFIG_CMD_NFS)
235 const char *s = getenv("autoload");
236
237 if (s != NULL && strcmp(s, "NFS") == 0) {
238 /*
239 * Use NFS to load the bootfile.
240 */
241 NfsStart();
242 return;
243 }
244 #endif
245 if (getenv_yesno("autoload") == 0) {
246 /*
247 * Just use BOOTP/RARP to configure system;
248 * Do not use TFTP to load the bootfile.
249 */
250 net_set_state(NETLOOP_SUCCESS);
251 return;
252 }
253 TftpStart(TFTPGET);
254 }
255
256 static void NetInitLoop(void)
257 {
258 static int env_changed_id;
259 int env_id = get_env_id();
260
261 /* update only when the environment has changed */
262 if (env_changed_id != env_id) {
263 NetOurIP = getenv_IPaddr("ipaddr");
264 NetOurGatewayIP = getenv_IPaddr("gatewayip");
265 NetOurSubnetMask = getenv_IPaddr("netmask");
266 NetServerIP = getenv_IPaddr("serverip");
267 NetOurNativeVLAN = getenv_VLAN("nvlan");
268 NetOurVLAN = getenv_VLAN("vlan");
269 #if defined(CONFIG_CMD_DNS)
270 NetOurDNSIP = getenv_IPaddr("dnsip");
271 #endif
272 env_changed_id = env_id;
273 }
274 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
275
276 return;
277 }
278
279 static void net_clear_handlers(void)
280 {
281 net_set_udp_handler(NULL);
282 net_set_arp_handler(NULL);
283 NetSetTimeout(0, NULL);
284 }
285
286 static void net_cleanup_loop(void)
287 {
288 net_clear_handlers();
289 }
290
291 void net_init(void)
292 {
293 static int first_call = 1;
294
295 if (first_call) {
296 /*
297 * Setup packet buffers, aligned correctly.
298 */
299 int i;
300
301 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
302 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
303 for (i = 0; i < PKTBUFSRX; i++)
304 NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
305
306 ArpInit();
307 net_clear_handlers();
308
309 /* Only need to setup buffer pointers once. */
310 first_call = 0;
311 }
312
313 NetInitLoop();
314 }
315
316 /**********************************************************************/
317 /*
318 * Main network processing loop.
319 */
320
321 int NetLoop(enum proto_t protocol)
322 {
323 bd_t *bd = gd->bd;
324 int ret = -1;
325
326 NetRestarted = 0;
327 NetDevExists = 0;
328 NetTryCount = 1;
329 debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n");
330
331 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
332 net_init();
333 if (eth_is_on_demand_init() || protocol != NETCONS) {
334 eth_halt();
335 eth_set_current();
336 if (eth_init(bd) < 0) {
337 eth_halt();
338 return -1;
339 }
340 } else
341 eth_init_state_only(bd);
342
343 restart:
344 net_set_state(NETLOOP_CONTINUE);
345
346 /*
347 * Start the ball rolling with the given start function. From
348 * here on, this code is a state machine driven by received
349 * packets and timer events.
350 */
351 debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n");
352 NetInitLoop();
353
354 switch (net_check_prereq(protocol)) {
355 case 1:
356 /* network not configured */
357 eth_halt();
358 return -1;
359
360 case 2:
361 /* network device not configured */
362 break;
363
364 case 0:
365 NetDevExists = 1;
366 NetBootFileXferSize = 0;
367 switch (protocol) {
368 case TFTPGET:
369 #ifdef CONFIG_CMD_TFTPPUT
370 case TFTPPUT:
371 #endif
372 /* always use ARP to get server ethernet address */
373 TftpStart(protocol);
374 break;
375 #ifdef CONFIG_CMD_TFTPSRV
376 case TFTPSRV:
377 TftpStartServer();
378 break;
379 #endif
380 #if defined(CONFIG_CMD_DHCP)
381 case DHCP:
382 BootpTry = 0;
383 NetOurIP = 0;
384 DhcpRequest(); /* Basically same as BOOTP */
385 break;
386 #endif
387
388 case BOOTP:
389 BootpTry = 0;
390 NetOurIP = 0;
391 BootpRequest();
392 break;
393
394 #if defined(CONFIG_CMD_RARP)
395 case RARP:
396 RarpTry = 0;
397 NetOurIP = 0;
398 RarpRequest();
399 break;
400 #endif
401 #if defined(CONFIG_CMD_PING)
402 case PING:
403 ping_start();
404 break;
405 #endif
406 #if defined(CONFIG_CMD_NFS)
407 case NFS:
408 NfsStart();
409 break;
410 #endif
411 #if defined(CONFIG_CMD_CDP)
412 case CDP:
413 CDPStart();
414 break;
415 #endif
416 #ifdef CONFIG_NETCONSOLE
417 case NETCONS:
418 NcStart();
419 break;
420 #endif
421 #if defined(CONFIG_CMD_SNTP)
422 case SNTP:
423 SntpStart();
424 break;
425 #endif
426 #if defined(CONFIG_CMD_DNS)
427 case DNS:
428 DnsStart();
429 break;
430 #endif
431 #if defined(CONFIG_CMD_LINK_LOCAL)
432 case LINKLOCAL:
433 link_local_start();
434 break;
435 #endif
436 default:
437 break;
438 }
439
440 break;
441 }
442
443 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
444 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
445 defined(CONFIG_STATUS_LED) && \
446 defined(STATUS_LED_RED)
447 /*
448 * Echo the inverted link state to the fault LED.
449 */
450 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
451 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
452 else
453 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
454 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
455 #endif /* CONFIG_MII, ... */
456
457 /*
458 * Main packet reception loop. Loop receiving packets until
459 * someone sets `net_state' to a state that terminates.
460 */
461 for (;;) {
462 WATCHDOG_RESET();
463 #ifdef CONFIG_SHOW_ACTIVITY
464 show_activity(1);
465 #endif
466 /*
467 * Check the ethernet for a new packet. The ethernet
468 * receive routine will process it.
469 */
470 eth_rx();
471
472 /*
473 * Abort if ctrl-c was pressed.
474 */
475 if (ctrlc()) {
476 /* cancel any ARP that may not have completed */
477 NetArpWaitPacketIP = 0;
478
479 net_cleanup_loop();
480 eth_halt();
481 /* Invalidate the last protocol */
482 eth_set_last_protocol(BOOTP);
483
484 puts("\nAbort\n");
485 /* include a debug print as well incase the debug
486 messages are directed to stderr */
487 debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n");
488 goto done;
489 }
490
491 ArpTimeoutCheck();
492
493 /*
494 * Check for a timeout, and run the timeout handler
495 * if we have one.
496 */
497 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
498 thand_f *x;
499
500 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
501 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
502 defined(CONFIG_STATUS_LED) && \
503 defined(STATUS_LED_RED)
504 /*
505 * Echo the inverted link state to the fault LED.
506 */
507 if (miiphy_link(eth_get_dev()->name,
508 CONFIG_SYS_FAULT_MII_ADDR)) {
509 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
510 } else {
511 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
512 }
513 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
514 #endif /* CONFIG_MII, ... */
515 debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n");
516 x = timeHandler;
517 timeHandler = (thand_f *)0;
518 (*x)();
519 }
520
521
522 switch (net_state) {
523
524 case NETLOOP_RESTART:
525 NetRestarted = 1;
526 goto restart;
527
528 case NETLOOP_SUCCESS:
529 net_cleanup_loop();
530 if (NetBootFileXferSize > 0) {
531 printf("Bytes transferred = %ld (%lx hex)\n",
532 NetBootFileXferSize,
533 NetBootFileXferSize);
534 setenv_hex("filesize", NetBootFileXferSize);
535 setenv_hex("fileaddr", load_addr);
536 }
537 if (protocol != NETCONS)
538 eth_halt();
539 else
540 eth_halt_state_only();
541
542 eth_set_last_protocol(protocol);
543
544 ret = NetBootFileXferSize;
545 debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n");
546 goto done;
547
548 case NETLOOP_FAIL:
549 net_cleanup_loop();
550 /* Invalidate the last protocol */
551 eth_set_last_protocol(BOOTP);
552 debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n");
553 goto done;
554
555 case NETLOOP_CONTINUE:
556 continue;
557 }
558 }
559
560 done:
561 #ifdef CONFIG_CMD_TFTPPUT
562 /* Clear out the handlers */
563 net_set_udp_handler(NULL);
564 net_set_icmp_handler(NULL);
565 #endif
566 return ret;
567 }
568
569 /**********************************************************************/
570
571 static void
572 startAgainTimeout(void)
573 {
574 net_set_state(NETLOOP_RESTART);
575 }
576
577 void NetStartAgain(void)
578 {
579 char *nretry;
580 int retry_forever = 0;
581 unsigned long retrycnt = 0;
582
583 nretry = getenv("netretry");
584 if (nretry) {
585 if (!strcmp(nretry, "yes"))
586 retry_forever = 1;
587 else if (!strcmp(nretry, "no"))
588 retrycnt = 0;
589 else if (!strcmp(nretry, "once"))
590 retrycnt = 1;
591 else
592 retrycnt = simple_strtoul(nretry, NULL, 0);
593 } else
594 retry_forever = 1;
595
596 if ((!retry_forever) && (NetTryCount >= retrycnt)) {
597 eth_halt();
598 net_set_state(NETLOOP_FAIL);
599 return;
600 }
601
602 NetTryCount++;
603
604 eth_halt();
605 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
606 eth_try_another(!NetRestarted);
607 #endif
608 eth_init(gd->bd);
609 if (NetRestartWrap) {
610 NetRestartWrap = 0;
611 if (NetDevExists) {
612 NetSetTimeout(10000UL, startAgainTimeout);
613 net_set_udp_handler(NULL);
614 } else {
615 net_set_state(NETLOOP_FAIL);
616 }
617 } else {
618 net_set_state(NETLOOP_RESTART);
619 }
620 }
621
622 /**********************************************************************/
623 /*
624 * Miscelaneous bits.
625 */
626
627 static void dummy_handler(uchar *pkt, unsigned dport,
628 IPaddr_t sip, unsigned sport,
629 unsigned len)
630 {
631 }
632
633 rxhand_f *net_get_udp_handler(void)
634 {
635 return udp_packet_handler;
636 }
637
638 void net_set_udp_handler(rxhand_f *f)
639 {
640 debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f);
641 if (f == NULL)
642 udp_packet_handler = dummy_handler;
643 else
644 udp_packet_handler = f;
645 }
646
647 rxhand_f *net_get_arp_handler(void)
648 {
649 return arp_packet_handler;
650 }
651
652 void net_set_arp_handler(rxhand_f *f)
653 {
654 debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f);
655 if (f == NULL)
656 arp_packet_handler = dummy_handler;
657 else
658 arp_packet_handler = f;
659 }
660
661 #ifdef CONFIG_CMD_TFTPPUT
662 void net_set_icmp_handler(rxhand_icmp_f *f)
663 {
664 packet_icmp_handler = f;
665 }
666 #endif
667
668 void
669 NetSetTimeout(ulong iv, thand_f *f)
670 {
671 if (iv == 0) {
672 debug_cond(DEBUG_INT_STATE,
673 "--- NetLoop timeout handler cancelled\n");
674 timeHandler = (thand_f *)0;
675 } else {
676 debug_cond(DEBUG_INT_STATE,
677 "--- NetLoop timeout handler set (%p)\n", f);
678 timeHandler = f;
679 timeStart = get_timer(0);
680 timeDelta = iv * CONFIG_SYS_HZ / 1000;
681 }
682 }
683
684 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
685 int payload_len)
686 {
687 uchar *pkt;
688 int eth_hdr_size;
689 int pkt_hdr_size;
690
691 /* make sure the NetTxPacket is initialized (NetInit() was called) */
692 assert(NetTxPacket != NULL);
693 if (NetTxPacket == NULL)
694 return -1;
695
696 /* convert to new style broadcast */
697 if (dest == 0)
698 dest = 0xFFFFFFFF;
699
700 /* if broadcast, make the ether address a broadcast and don't do ARP */
701 if (dest == 0xFFFFFFFF)
702 ether = NetBcastAddr;
703
704 pkt = (uchar *)NetTxPacket;
705
706 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
707 pkt += eth_hdr_size;
708 net_set_udp_header(pkt, dest, dport, sport, payload_len);
709 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
710
711 /* if MAC address was not discovered yet, do an ARP request */
712 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
713 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
714
715 /* save the ip and eth addr for the packet to send after arp */
716 NetArpWaitPacketIP = dest;
717 NetArpWaitPacketMAC = ether;
718
719 /* size of the waiting packet */
720 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
721
722 /* and do the ARP request */
723 NetArpWaitTry = 1;
724 NetArpWaitTimerStart = get_timer(0);
725 ArpRequest();
726 return 1; /* waiting */
727 } else {
728 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
729 &dest, ether);
730 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len);
731 return 0; /* transmitted */
732 }
733 }
734
735 #ifdef CONFIG_IP_DEFRAG
736 /*
737 * This function collects fragments in a single packet, according
738 * to the algorithm in RFC815. It returns NULL or the pointer to
739 * a complete packet, in static storage
740 */
741 #ifndef CONFIG_NET_MAXDEFRAG
742 #define CONFIG_NET_MAXDEFRAG 16384
743 #endif
744 /*
745 * MAXDEFRAG, above, is chosen in the config file and is real data
746 * so we need to add the NFS overhead, which is more than TFTP.
747 * To use sizeof in the internal unnamed structures, we need a real
748 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
749 * The compiler doesn't complain nor allocates the actual structure
750 */
751 static struct rpc_t rpc_specimen;
752 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
753
754 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
755
756 /*
757 * this is the packet being assembled, either data or frag control.
758 * Fragments go by 8 bytes, so this union must be 8 bytes long
759 */
760 struct hole {
761 /* first_byte is address of this structure */
762 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
763 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
764 u16 prev_hole; /* index of prev, 0 == none */
765 u16 unused;
766 };
767
768 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
769 {
770 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
771 static u16 first_hole, total_len;
772 struct hole *payload, *thisfrag, *h, *newh;
773 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
774 uchar *indata = (uchar *)ip;
775 int offset8, start, len, done = 0;
776 u16 ip_off = ntohs(ip->ip_off);
777
778 /* payload starts after IP header, this fragment is in there */
779 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
780 offset8 = (ip_off & IP_OFFS);
781 thisfrag = payload + offset8;
782 start = offset8 * 8;
783 len = ntohs(ip->ip_len) - IP_HDR_SIZE;
784
785 if (start + len > IP_MAXUDP) /* fragment extends too far */
786 return NULL;
787
788 if (!total_len || localip->ip_id != ip->ip_id) {
789 /* new (or different) packet, reset structs */
790 total_len = 0xffff;
791 payload[0].last_byte = ~0;
792 payload[0].next_hole = 0;
793 payload[0].prev_hole = 0;
794 first_hole = 0;
795 /* any IP header will work, copy the first we received */
796 memcpy(localip, ip, IP_HDR_SIZE);
797 }
798
799 /*
800 * What follows is the reassembly algorithm. We use the payload
801 * array as a linked list of hole descriptors, as each hole starts
802 * at a multiple of 8 bytes. However, last byte can be whatever value,
803 * so it is represented as byte count, not as 8-byte blocks.
804 */
805
806 h = payload + first_hole;
807 while (h->last_byte < start) {
808 if (!h->next_hole) {
809 /* no hole that far away */
810 return NULL;
811 }
812 h = payload + h->next_hole;
813 }
814
815 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
816 if (offset8 + ((len + 7) / 8) <= h - payload) {
817 /* no overlap with holes (dup fragment?) */
818 return NULL;
819 }
820
821 if (!(ip_off & IP_FLAGS_MFRAG)) {
822 /* no more fragmentss: truncate this (last) hole */
823 total_len = start + len;
824 h->last_byte = start + len;
825 }
826
827 /*
828 * There is some overlap: fix the hole list. This code doesn't
829 * deal with a fragment that overlaps with two different holes
830 * (thus being a superset of a previously-received fragment).
831 */
832
833 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
834 /* complete overlap with hole: remove hole */
835 if (!h->prev_hole && !h->next_hole) {
836 /* last remaining hole */
837 done = 1;
838 } else if (!h->prev_hole) {
839 /* first hole */
840 first_hole = h->next_hole;
841 payload[h->next_hole].prev_hole = 0;
842 } else if (!h->next_hole) {
843 /* last hole */
844 payload[h->prev_hole].next_hole = 0;
845 } else {
846 /* in the middle of the list */
847 payload[h->next_hole].prev_hole = h->prev_hole;
848 payload[h->prev_hole].next_hole = h->next_hole;
849 }
850
851 } else if (h->last_byte <= start + len) {
852 /* overlaps with final part of the hole: shorten this hole */
853 h->last_byte = start;
854
855 } else if (h >= thisfrag) {
856 /* overlaps with initial part of the hole: move this hole */
857 newh = thisfrag + (len / 8);
858 *newh = *h;
859 h = newh;
860 if (h->next_hole)
861 payload[h->next_hole].prev_hole = (h - payload);
862 if (h->prev_hole)
863 payload[h->prev_hole].next_hole = (h - payload);
864 else
865 first_hole = (h - payload);
866
867 } else {
868 /* fragment sits in the middle: split the hole */
869 newh = thisfrag + (len / 8);
870 *newh = *h;
871 h->last_byte = start;
872 h->next_hole = (newh - payload);
873 newh->prev_hole = (h - payload);
874 if (newh->next_hole)
875 payload[newh->next_hole].prev_hole = (newh - payload);
876 }
877
878 /* finally copy this fragment and possibly return whole packet */
879 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
880 if (!done)
881 return NULL;
882
883 localip->ip_len = htons(total_len);
884 *lenp = total_len + IP_HDR_SIZE;
885 return localip;
886 }
887
888 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
889 {
890 u16 ip_off = ntohs(ip->ip_off);
891 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
892 return ip; /* not a fragment */
893 return __NetDefragment(ip, lenp);
894 }
895
896 #else /* !CONFIG_IP_DEFRAG */
897
898 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
899 {
900 u16 ip_off = ntohs(ip->ip_off);
901 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
902 return ip; /* not a fragment */
903 return NULL;
904 }
905 #endif
906
907 /**
908 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
909 * drop others.
910 *
911 * @parma ip IP packet containing the ICMP
912 */
913 static void receive_icmp(struct ip_udp_hdr *ip, int len,
914 IPaddr_t src_ip, struct ethernet_hdr *et)
915 {
916 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
917
918 switch (icmph->type) {
919 case ICMP_REDIRECT:
920 if (icmph->code != ICMP_REDIR_HOST)
921 return;
922 printf(" ICMP Host Redirect to %pI4 ",
923 &icmph->un.gateway);
924 break;
925 default:
926 #if defined(CONFIG_CMD_PING)
927 ping_receive(et, ip, len);
928 #endif
929 #ifdef CONFIG_CMD_TFTPPUT
930 if (packet_icmp_handler)
931 packet_icmp_handler(icmph->type, icmph->code,
932 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
933 icmph->un.data, ntohs(ip->udp_len));
934 #endif
935 break;
936 }
937 }
938
939 void
940 NetReceive(uchar *inpkt, int len)
941 {
942 struct ethernet_hdr *et;
943 struct ip_udp_hdr *ip;
944 IPaddr_t dst_ip;
945 IPaddr_t src_ip;
946 int eth_proto;
947 #if defined(CONFIG_CMD_CDP)
948 int iscdp;
949 #endif
950 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
951
952 debug_cond(DEBUG_NET_PKT, "packet received\n");
953
954 NetRxPacket = inpkt;
955 NetRxPacketLen = len;
956 et = (struct ethernet_hdr *)inpkt;
957
958 /* too small packet? */
959 if (len < ETHER_HDR_SIZE)
960 return;
961
962 #ifdef CONFIG_API
963 if (push_packet) {
964 (*push_packet)(inpkt, len);
965 return;
966 }
967 #endif
968
969 #if defined(CONFIG_CMD_CDP)
970 /* keep track if packet is CDP */
971 iscdp = is_cdp_packet(et->et_dest);
972 #endif
973
974 myvlanid = ntohs(NetOurVLAN);
975 if (myvlanid == (ushort)-1)
976 myvlanid = VLAN_NONE;
977 mynvlanid = ntohs(NetOurNativeVLAN);
978 if (mynvlanid == (ushort)-1)
979 mynvlanid = VLAN_NONE;
980
981 eth_proto = ntohs(et->et_protlen);
982
983 if (eth_proto < 1514) {
984 struct e802_hdr *et802 = (struct e802_hdr *)et;
985 /*
986 * Got a 802.2 packet. Check the other protocol field.
987 * XXX VLAN over 802.2+SNAP not implemented!
988 */
989 eth_proto = ntohs(et802->et_prot);
990
991 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
992 len -= E802_HDR_SIZE;
993
994 } else if (eth_proto != PROT_VLAN) { /* normal packet */
995 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
996 len -= ETHER_HDR_SIZE;
997
998 } else { /* VLAN packet */
999 struct vlan_ethernet_hdr *vet =
1000 (struct vlan_ethernet_hdr *)et;
1001
1002 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1003
1004 /* too small packet? */
1005 if (len < VLAN_ETHER_HDR_SIZE)
1006 return;
1007
1008 /* if no VLAN active */
1009 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1010 #if defined(CONFIG_CMD_CDP)
1011 && iscdp == 0
1012 #endif
1013 )
1014 return;
1015
1016 cti = ntohs(vet->vet_tag);
1017 vlanid = cti & VLAN_IDMASK;
1018 eth_proto = ntohs(vet->vet_type);
1019
1020 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
1021 len -= VLAN_ETHER_HDR_SIZE;
1022 }
1023
1024 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1025
1026 #if defined(CONFIG_CMD_CDP)
1027 if (iscdp) {
1028 cdp_receive((uchar *)ip, len);
1029 return;
1030 }
1031 #endif
1032
1033 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1034 if (vlanid == VLAN_NONE)
1035 vlanid = (mynvlanid & VLAN_IDMASK);
1036 /* not matched? */
1037 if (vlanid != (myvlanid & VLAN_IDMASK))
1038 return;
1039 }
1040
1041 switch (eth_proto) {
1042
1043 case PROT_ARP:
1044 ArpReceive(et, ip, len);
1045 break;
1046
1047 #ifdef CONFIG_CMD_RARP
1048 case PROT_RARP:
1049 rarp_receive(ip, len);
1050 break;
1051 #endif
1052 case PROT_IP:
1053 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1054 /* Before we start poking the header, make sure it is there */
1055 if (len < IP_UDP_HDR_SIZE) {
1056 debug("len bad %d < %lu\n", len,
1057 (ulong)IP_UDP_HDR_SIZE);
1058 return;
1059 }
1060 /* Check the packet length */
1061 if (len < ntohs(ip->ip_len)) {
1062 debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1063 return;
1064 }
1065 len = ntohs(ip->ip_len);
1066 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1067 len, ip->ip_hl_v & 0xff);
1068
1069 /* Can't deal with anything except IPv4 */
1070 if ((ip->ip_hl_v & 0xf0) != 0x40)
1071 return;
1072 /* Can't deal with IP options (headers != 20 bytes) */
1073 if ((ip->ip_hl_v & 0x0f) > 0x05)
1074 return;
1075 /* Check the Checksum of the header */
1076 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) {
1077 debug("checksum bad\n");
1078 return;
1079 }
1080 /* If it is not for us, ignore it */
1081 dst_ip = NetReadIP(&ip->ip_dst);
1082 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
1083 #ifdef CONFIG_MCAST_TFTP
1084 if (Mcast_addr != dst_ip)
1085 #endif
1086 return;
1087 }
1088 /* Read source IP address for later use */
1089 src_ip = NetReadIP(&ip->ip_src);
1090 /*
1091 * The function returns the unchanged packet if it's not
1092 * a fragment, and either the complete packet or NULL if
1093 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1094 */
1095 ip = NetDefragment(ip, &len);
1096 if (!ip)
1097 return;
1098 /*
1099 * watch for ICMP host redirects
1100 *
1101 * There is no real handler code (yet). We just watch
1102 * for ICMP host redirect messages. In case anybody
1103 * sees these messages: please contact me
1104 * (wd@denx.de), or - even better - send me the
1105 * necessary fixes :-)
1106 *
1107 * Note: in all cases where I have seen this so far
1108 * it was a problem with the router configuration,
1109 * for instance when a router was configured in the
1110 * BOOTP reply, but the TFTP server was on the same
1111 * subnet. So this is probably a warning that your
1112 * configuration might be wrong. But I'm not really
1113 * sure if there aren't any other situations.
1114 *
1115 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1116 * we send a tftp packet to a dead connection, or when
1117 * there is no server at the other end.
1118 */
1119 if (ip->ip_p == IPPROTO_ICMP) {
1120 receive_icmp(ip, len, src_ip, et);
1121 return;
1122 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1123 return;
1124 }
1125
1126 debug_cond(DEBUG_DEV_PKT,
1127 "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1128 &dst_ip, &src_ip, len);
1129
1130 #ifdef CONFIG_UDP_CHECKSUM
1131 if (ip->udp_xsum != 0) {
1132 ulong xsum;
1133 ushort *sumptr;
1134 ushort sumlen;
1135
1136 xsum = ip->ip_p;
1137 xsum += (ntohs(ip->udp_len));
1138 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1139 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1140 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1141 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1142
1143 sumlen = ntohs(ip->udp_len);
1144 sumptr = (ushort *) &(ip->udp_src);
1145
1146 while (sumlen > 1) {
1147 ushort sumdata;
1148
1149 sumdata = *sumptr++;
1150 xsum += ntohs(sumdata);
1151 sumlen -= 2;
1152 }
1153 if (sumlen > 0) {
1154 ushort sumdata;
1155
1156 sumdata = *(unsigned char *) sumptr;
1157 sumdata = (sumdata << 8) & 0xff00;
1158 xsum += sumdata;
1159 }
1160 while ((xsum >> 16) != 0) {
1161 xsum = (xsum & 0x0000ffff) +
1162 ((xsum >> 16) & 0x0000ffff);
1163 }
1164 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1165 printf(" UDP wrong checksum %08lx %08x\n",
1166 xsum, ntohs(ip->udp_xsum));
1167 return;
1168 }
1169 }
1170 #endif
1171
1172
1173 #ifdef CONFIG_NETCONSOLE
1174 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1175 src_ip,
1176 ntohs(ip->udp_dst),
1177 ntohs(ip->udp_src),
1178 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1179 #endif
1180 /*
1181 * IP header OK. Pass the packet to the current handler.
1182 */
1183 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1184 ntohs(ip->udp_dst),
1185 src_ip,
1186 ntohs(ip->udp_src),
1187 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1188 break;
1189 }
1190 }
1191
1192
1193 /**********************************************************************/
1194
1195 static int net_check_prereq(enum proto_t protocol)
1196 {
1197 switch (protocol) {
1198 /* Fall through */
1199 #if defined(CONFIG_CMD_PING)
1200 case PING:
1201 if (NetPingIP == 0) {
1202 puts("*** ERROR: ping address not given\n");
1203 return 1;
1204 }
1205 goto common;
1206 #endif
1207 #if defined(CONFIG_CMD_SNTP)
1208 case SNTP:
1209 if (NetNtpServerIP == 0) {
1210 puts("*** ERROR: NTP server address not given\n");
1211 return 1;
1212 }
1213 goto common;
1214 #endif
1215 #if defined(CONFIG_CMD_DNS)
1216 case DNS:
1217 if (NetOurDNSIP == 0) {
1218 puts("*** ERROR: DNS server address not given\n");
1219 return 1;
1220 }
1221 goto common;
1222 #endif
1223 #if defined(CONFIG_CMD_NFS)
1224 case NFS:
1225 #endif
1226 case TFTPGET:
1227 case TFTPPUT:
1228 if (NetServerIP == 0) {
1229 puts("*** ERROR: `serverip' not set\n");
1230 return 1;
1231 }
1232 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1233 defined(CONFIG_CMD_DNS)
1234 common:
1235 #endif
1236 /* Fall through */
1237
1238 case NETCONS:
1239 case TFTPSRV:
1240 if (NetOurIP == 0) {
1241 puts("*** ERROR: `ipaddr' not set\n");
1242 return 1;
1243 }
1244 /* Fall through */
1245
1246 #ifdef CONFIG_CMD_RARP
1247 case RARP:
1248 #endif
1249 case BOOTP:
1250 case CDP:
1251 case DHCP:
1252 case LINKLOCAL:
1253 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1254 int num = eth_get_dev_index();
1255
1256 switch (num) {
1257 case -1:
1258 puts("*** ERROR: No ethernet found.\n");
1259 return 1;
1260 case 0:
1261 puts("*** ERROR: `ethaddr' not set\n");
1262 break;
1263 default:
1264 printf("*** ERROR: `eth%daddr' not set\n",
1265 num);
1266 break;
1267 }
1268
1269 NetStartAgain();
1270 return 2;
1271 }
1272 /* Fall through */
1273 default:
1274 return 0;
1275 }
1276 return 0; /* OK */
1277 }
1278 /**********************************************************************/
1279
1280 int
1281 NetCksumOk(uchar *ptr, int len)
1282 {
1283 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1284 }
1285
1286
1287 unsigned
1288 NetCksum(uchar *ptr, int len)
1289 {
1290 ulong xsum;
1291 ushort *p = (ushort *)ptr;
1292
1293 xsum = 0;
1294 while (len-- > 0)
1295 xsum += *p++;
1296 xsum = (xsum & 0xffff) + (xsum >> 16);
1297 xsum = (xsum & 0xffff) + (xsum >> 16);
1298 return xsum & 0xffff;
1299 }
1300
1301 int
1302 NetEthHdrSize(void)
1303 {
1304 ushort myvlanid;
1305
1306 myvlanid = ntohs(NetOurVLAN);
1307 if (myvlanid == (ushort)-1)
1308 myvlanid = VLAN_NONE;
1309
1310 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1311 VLAN_ETHER_HDR_SIZE;
1312 }
1313
1314 int
1315 NetSetEther(uchar *xet, uchar * addr, uint prot)
1316 {
1317 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1318 ushort myvlanid;
1319
1320 myvlanid = ntohs(NetOurVLAN);
1321 if (myvlanid == (ushort)-1)
1322 myvlanid = VLAN_NONE;
1323
1324 memcpy(et->et_dest, addr, 6);
1325 memcpy(et->et_src, NetOurEther, 6);
1326 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1327 et->et_protlen = htons(prot);
1328 return ETHER_HDR_SIZE;
1329 } else {
1330 struct vlan_ethernet_hdr *vet =
1331 (struct vlan_ethernet_hdr *)xet;
1332
1333 vet->vet_vlan_type = htons(PROT_VLAN);
1334 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1335 vet->vet_type = htons(prot);
1336 return VLAN_ETHER_HDR_SIZE;
1337 }
1338 }
1339
1340 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1341 {
1342 ushort protlen;
1343
1344 memcpy(et->et_dest, addr, 6);
1345 memcpy(et->et_src, NetOurEther, 6);
1346 protlen = ntohs(et->et_protlen);
1347 if (protlen == PROT_VLAN) {
1348 struct vlan_ethernet_hdr *vet =
1349 (struct vlan_ethernet_hdr *)et;
1350 vet->vet_type = htons(prot);
1351 return VLAN_ETHER_HDR_SIZE;
1352 } else if (protlen > 1514) {
1353 et->et_protlen = htons(prot);
1354 return ETHER_HDR_SIZE;
1355 } else {
1356 /* 802.2 + SNAP */
1357 struct e802_hdr *et802 = (struct e802_hdr *)et;
1358 et802->et_prot = htons(prot);
1359 return E802_HDR_SIZE;
1360 }
1361 }
1362
1363 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
1364 {
1365 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1366
1367 /*
1368 * Construct an IP header.
1369 */
1370 /* IP_HDR_SIZE / 4 (not including UDP) */
1371 ip->ip_hl_v = 0x45;
1372 ip->ip_tos = 0;
1373 ip->ip_len = htons(IP_HDR_SIZE);
1374 ip->ip_id = htons(NetIPID++);
1375 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1376 ip->ip_ttl = 255;
1377 ip->ip_sum = 0;
1378 /* already in network byte order */
1379 NetCopyIP((void *)&ip->ip_src, &source);
1380 /* already in network byte order */
1381 NetCopyIP((void *)&ip->ip_dst, &dest);
1382 }
1383
1384 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
1385 int len)
1386 {
1387 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1388
1389 /*
1390 * If the data is an odd number of bytes, zero the
1391 * byte after the last byte so that the checksum
1392 * will work.
1393 */
1394 if (len & 1)
1395 pkt[IP_UDP_HDR_SIZE + len] = 0;
1396
1397 net_set_ip_header(pkt, dest, NetOurIP);
1398 ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
1399 ip->ip_p = IPPROTO_UDP;
1400 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
1401
1402 ip->udp_src = htons(sport);
1403 ip->udp_dst = htons(dport);
1404 ip->udp_len = htons(UDP_HDR_SIZE + len);
1405 ip->udp_xsum = 0;
1406 }
1407
1408 void copy_filename(char *dst, const char *src, int size)
1409 {
1410 if (*src && (*src == '"')) {
1411 ++src;
1412 --size;
1413 }
1414
1415 while ((--size > 0) && *src && (*src != '"'))
1416 *dst++ = *src++;
1417 *dst = '\0';
1418 }
1419
1420 #if defined(CONFIG_CMD_NFS) || \
1421 defined(CONFIG_CMD_SNTP) || \
1422 defined(CONFIG_CMD_DNS)
1423 /*
1424 * make port a little random (1024-17407)
1425 * This keeps the math somewhat trivial to compute, and seems to work with
1426 * all supported protocols/clients/servers
1427 */
1428 unsigned int random_port(void)
1429 {
1430 return 1024 + (get_timer(0) % 0x4000);
1431 }
1432 #endif
1433
1434 void ip_to_string(IPaddr_t x, char *s)
1435 {
1436 x = ntohl(x);
1437 sprintf(s, "%d.%d.%d.%d",
1438 (int) ((x >> 24) & 0xff),
1439 (int) ((x >> 16) & 0xff),
1440 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1441 );
1442 }
1443
1444 void VLAN_to_string(ushort x, char *s)
1445 {
1446 x = ntohs(x);
1447
1448 if (x == (ushort)-1)
1449 x = VLAN_NONE;
1450
1451 if (x == VLAN_NONE)
1452 strcpy(s, "none");
1453 else
1454 sprintf(s, "%d", x & VLAN_IDMASK);
1455 }
1456
1457 ushort string_to_VLAN(const char *s)
1458 {
1459 ushort id;
1460
1461 if (s == NULL)
1462 return htons(VLAN_NONE);
1463
1464 if (*s < '0' || *s > '9')
1465 id = VLAN_NONE;
1466 else
1467 id = (ushort)simple_strtoul(s, NULL, 10);
1468
1469 return htons(id);
1470 }
1471
1472 ushort getenv_VLAN(char *var)
1473 {
1474 return string_to_VLAN(getenv(var));
1475 }
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