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