Merge branch 'next'
[platform/kernel/u-boot.git] / net / net.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *      Copied from Linux Monitor (LiMon) - Networking.
4  *
5  *      Copyright 1994 - 2000 Neil Russell.
6  *      (See License)
7  *      Copyright 2000 Roland Borde
8  *      Copyright 2000 Paolo Scaffardi
9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
10  */
11
12 /*
13  * General Desription:
14  *
15  * The user interface supports commands for BOOTP, RARP, and TFTP.
16  * Also, we support ARP internally. Depending on available data,
17  * these interact as follows:
18  *
19  * BOOTP:
20  *
21  *      Prerequisites:  - own ethernet address
22  *      We want:        - own IP address
23  *                      - TFTP server IP address
24  *                      - name of bootfile
25  *      Next step:      ARP
26  *
27  * LINK_LOCAL:
28  *
29  *      Prerequisites:  - own ethernet address
30  *      We want:        - own IP address
31  *      Next step:      ARP
32  *
33  * RARP:
34  *
35  *      Prerequisites:  - own ethernet address
36  *      We want:        - own IP address
37  *                      - TFTP server IP address
38  *      Next step:      ARP
39  *
40  * ARP:
41  *
42  *      Prerequisites:  - own ethernet address
43  *                      - own IP address
44  *                      - TFTP server IP address
45  *      We want:        - TFTP server ethernet address
46  *      Next step:      TFTP
47  *
48  * DHCP:
49  *
50  *     Prerequisites:   - own ethernet address
51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
52  *                      - bootfilename, lease time
53  *     Next step:       - TFTP
54  *
55  * TFTP:
56  *
57  *      Prerequisites:  - own ethernet address
58  *                      - own IP address
59  *                      - TFTP server IP address
60  *                      - TFTP server ethernet address
61  *                      - name of bootfile (if unknown, we use a default name
62  *                        derived from our own IP address)
63  *      We want:        - load the boot file
64  *      Next step:      none
65  *
66  * NFS:
67  *
68  *      Prerequisites:  - own ethernet address
69  *                      - own IP address
70  *                      - name of bootfile (if unknown, we use a default name
71  *                        derived from our own IP address)
72  *      We want:        - load the boot file
73  *      Next step:      none
74  *
75  *
76  * WOL:
77  *
78  *      Prerequisites:  - own ethernet address
79  *      We want:        - magic packet or timeout
80  *      Next step:      none
81  */
82
83
84 #include <common.h>
85 #include <bootstage.h>
86 #include <command.h>
87 #include <console.h>
88 #include <env.h>
89 #include <env_internal.h>
90 #include <errno.h>
91 #include <image.h>
92 #include <log.h>
93 #include <net.h>
94 #include <net/fastboot.h>
95 #include <net/tftp.h>
96 #if defined(CONFIG_CMD_PCAP)
97 #include <net/pcap.h>
98 #endif
99 #include <net/udp.h>
100 #if defined(CONFIG_LED_STATUS)
101 #include <miiphy.h>
102 #include <status_led.h>
103 #endif
104 #include <watchdog.h>
105 #include <linux/compiler.h>
106 #include "arp.h"
107 #include "bootp.h"
108 #include "cdp.h"
109 #if defined(CONFIG_CMD_DNS)
110 #include "dns.h"
111 #endif
112 #include "link_local.h"
113 #include "nfs.h"
114 #include "ping.h"
115 #include "rarp.h"
116 #if defined(CONFIG_CMD_WOL)
117 #include "wol.h"
118 #endif
119
120 /** BOOTP EXTENTIONS **/
121
122 /* Our subnet mask (0=unknown) */
123 struct in_addr net_netmask;
124 /* Our gateways IP address */
125 struct in_addr net_gateway;
126 /* Our DNS IP address */
127 struct in_addr net_dns_server;
128 #if defined(CONFIG_BOOTP_DNS2)
129 /* Our 2nd DNS IP address */
130 struct in_addr net_dns_server2;
131 #endif
132
133 /** END OF BOOTP EXTENTIONS **/
134
135 /* Our ethernet address */
136 u8 net_ethaddr[6];
137 /* Boot server enet address */
138 u8 net_server_ethaddr[6];
139 /* Our IP addr (0 = unknown) */
140 struct in_addr  net_ip;
141 /* Server IP addr (0 = unknown) */
142 struct in_addr  net_server_ip;
143 /* Current receive packet */
144 uchar *net_rx_packet;
145 /* Current rx packet length */
146 int             net_rx_packet_len;
147 /* IP packet ID */
148 static unsigned net_ip_id;
149 /* Ethernet bcast address */
150 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
151 const u8 net_null_ethaddr[6];
152 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
153 void (*push_packet)(void *, int len) = 0;
154 #endif
155 /* Network loop state */
156 enum net_loop_state net_state;
157 /* Tried all network devices */
158 int             net_restart_wrap;
159 /* Network loop restarted */
160 static int      net_restarted;
161 /* At least one device configured */
162 static int      net_dev_exists;
163
164 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
165 /* default is without VLAN */
166 ushort          net_our_vlan = 0xFFFF;
167 /* ditto */
168 ushort          net_native_vlan = 0xFFFF;
169
170 /* Boot File name */
171 char net_boot_file_name[1024];
172 /* Indicates whether the file name was specified on the command line */
173 bool net_boot_file_name_explicit;
174 /* The actual transferred size of the bootfile (in bytes) */
175 u32 net_boot_file_size;
176 /* Boot file size in blocks as reported by the DHCP server */
177 u32 net_boot_file_expected_size_in_blocks;
178
179 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
180 /* Receive packets */
181 uchar *net_rx_packets[PKTBUFSRX];
182 /* Current UDP RX packet handler */
183 static rxhand_f *udp_packet_handler;
184 /* Current ARP RX packet handler */
185 static rxhand_f *arp_packet_handler;
186 #ifdef CONFIG_CMD_TFTPPUT
187 /* Current ICMP rx handler */
188 static rxhand_icmp_f *packet_icmp_handler;
189 #endif
190 /* Current timeout handler */
191 static thand_f *time_handler;
192 /* Time base value */
193 static ulong    time_start;
194 /* Current timeout value */
195 static ulong    time_delta;
196 /* THE transmit packet */
197 uchar *net_tx_packet;
198
199 static int net_check_prereq(enum proto_t protocol);
200
201 static int net_try_count;
202
203 int __maybe_unused net_busy_flag;
204
205 /**********************************************************************/
206
207 static int on_ipaddr(const char *name, const char *value, enum env_op op,
208         int flags)
209 {
210         if (flags & H_PROGRAMMATIC)
211                 return 0;
212
213         net_ip = string_to_ip(value);
214
215         return 0;
216 }
217 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
218
219 static int on_gatewayip(const char *name, const char *value, enum env_op op,
220         int flags)
221 {
222         if (flags & H_PROGRAMMATIC)
223                 return 0;
224
225         net_gateway = string_to_ip(value);
226
227         return 0;
228 }
229 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
230
231 static int on_netmask(const char *name, const char *value, enum env_op op,
232         int flags)
233 {
234         if (flags & H_PROGRAMMATIC)
235                 return 0;
236
237         net_netmask = string_to_ip(value);
238
239         return 0;
240 }
241 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
242
243 static int on_serverip(const char *name, const char *value, enum env_op op,
244         int flags)
245 {
246         if (flags & H_PROGRAMMATIC)
247                 return 0;
248
249         net_server_ip = string_to_ip(value);
250
251         return 0;
252 }
253 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
254
255 static int on_nvlan(const char *name, const char *value, enum env_op op,
256         int flags)
257 {
258         if (flags & H_PROGRAMMATIC)
259                 return 0;
260
261         net_native_vlan = string_to_vlan(value);
262
263         return 0;
264 }
265 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
266
267 static int on_vlan(const char *name, const char *value, enum env_op op,
268         int flags)
269 {
270         if (flags & H_PROGRAMMATIC)
271                 return 0;
272
273         net_our_vlan = string_to_vlan(value);
274
275         return 0;
276 }
277 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
278
279 #if defined(CONFIG_CMD_DNS)
280 static int on_dnsip(const char *name, const char *value, enum env_op op,
281         int flags)
282 {
283         if (flags & H_PROGRAMMATIC)
284                 return 0;
285
286         net_dns_server = string_to_ip(value);
287
288         return 0;
289 }
290 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
291 #endif
292
293 /*
294  * Check if autoload is enabled. If so, use either NFS or TFTP to download
295  * the boot file.
296  */
297 void net_auto_load(void)
298 {
299 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
300         const char *s = env_get("autoload");
301
302         if (s != NULL && strcmp(s, "NFS") == 0) {
303                 if (net_check_prereq(NFS)) {
304 /* We aren't expecting to get a serverip, so just accept the assigned IP */
305 #ifdef CONFIG_BOOTP_SERVERIP
306                         net_set_state(NETLOOP_SUCCESS);
307 #else
308                         printf("Cannot autoload with NFS\n");
309                         net_set_state(NETLOOP_FAIL);
310 #endif
311                         return;
312                 }
313                 /*
314                  * Use NFS to load the bootfile.
315                  */
316                 nfs_start();
317                 return;
318         }
319 #endif
320         if (env_get_yesno("autoload") == 0) {
321                 /*
322                  * Just use BOOTP/RARP to configure system;
323                  * Do not use TFTP to load the bootfile.
324                  */
325                 net_set_state(NETLOOP_SUCCESS);
326                 return;
327         }
328         if (net_check_prereq(TFTPGET)) {
329 /* We aren't expecting to get a serverip, so just accept the assigned IP */
330 #ifdef CONFIG_BOOTP_SERVERIP
331                 net_set_state(NETLOOP_SUCCESS);
332 #else
333                 printf("Cannot autoload with TFTPGET\n");
334                 net_set_state(NETLOOP_FAIL);
335 #endif
336                 return;
337         }
338         tftp_start(TFTPGET);
339 }
340
341 static void net_init_loop(void)
342 {
343         if (eth_get_dev())
344                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
345
346         return;
347 }
348
349 static void net_clear_handlers(void)
350 {
351         net_set_udp_handler(NULL);
352         net_set_arp_handler(NULL);
353         net_set_timeout_handler(0, NULL);
354 }
355
356 static void net_cleanup_loop(void)
357 {
358         net_clear_handlers();
359 }
360
361 void net_init(void)
362 {
363         static int first_call = 1;
364
365         if (first_call) {
366                 /*
367                  *      Setup packet buffers, aligned correctly.
368                  */
369                 int i;
370
371                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
372                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
373                 for (i = 0; i < PKTBUFSRX; i++) {
374                         net_rx_packets[i] = net_tx_packet +
375                                 (i + 1) * PKTSIZE_ALIGN;
376                 }
377                 arp_init();
378                 net_clear_handlers();
379
380                 /* Only need to setup buffer pointers once. */
381                 first_call = 0;
382         }
383
384         net_init_loop();
385 }
386
387 /**********************************************************************/
388 /*
389  *      Main network processing loop.
390  */
391
392 int net_loop(enum proto_t protocol)
393 {
394         int ret = -EINVAL;
395         enum net_loop_state prev_net_state = net_state;
396
397 #if defined(CONFIG_CMD_PING)
398         if (protocol != PING)
399                 net_ping_ip.s_addr = 0;
400 #endif
401         net_restarted = 0;
402         net_dev_exists = 0;
403         net_try_count = 1;
404         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
405
406         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
407         net_init();
408         if (eth_is_on_demand_init() || protocol != NETCONS) {
409                 eth_halt();
410                 eth_set_current();
411                 ret = eth_init();
412                 if (ret < 0) {
413                         eth_halt();
414                         return ret;
415                 }
416         } else {
417                 eth_init_state_only();
418         }
419 restart:
420 #ifdef CONFIG_USB_KEYBOARD
421         net_busy_flag = 0;
422 #endif
423         net_set_state(NETLOOP_CONTINUE);
424
425         /*
426          *      Start the ball rolling with the given start function.  From
427          *      here on, this code is a state machine driven by received
428          *      packets and timer events.
429          */
430         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
431         net_init_loop();
432
433         switch (net_check_prereq(protocol)) {
434         case 1:
435                 /* network not configured */
436                 eth_halt();
437                 net_set_state(prev_net_state);
438                 return -ENODEV;
439
440         case 2:
441                 /* network device not configured */
442                 break;
443
444         case 0:
445                 net_dev_exists = 1;
446                 net_boot_file_size = 0;
447                 switch (protocol) {
448 #ifdef CONFIG_CMD_TFTPBOOT
449                 case TFTPGET:
450 #ifdef CONFIG_CMD_TFTPPUT
451                 case TFTPPUT:
452 #endif
453                         /* always use ARP to get server ethernet address */
454                         tftp_start(protocol);
455                         break;
456 #endif
457 #ifdef CONFIG_CMD_TFTPSRV
458                 case TFTPSRV:
459                         tftp_start_server();
460                         break;
461 #endif
462 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
463                 case FASTBOOT:
464                         fastboot_start_server();
465                         break;
466 #endif
467 #if defined(CONFIG_CMD_DHCP)
468                 case DHCP:
469                         bootp_reset();
470                         net_ip.s_addr = 0;
471                         dhcp_request();         /* Basically same as BOOTP */
472                         break;
473 #endif
474 #if defined(CONFIG_CMD_BOOTP)
475                 case BOOTP:
476                         bootp_reset();
477                         net_ip.s_addr = 0;
478                         bootp_request();
479                         break;
480 #endif
481 #if defined(CONFIG_CMD_RARP)
482                 case RARP:
483                         rarp_try = 0;
484                         net_ip.s_addr = 0;
485                         rarp_request();
486                         break;
487 #endif
488 #if defined(CONFIG_CMD_PING)
489                 case PING:
490                         ping_start();
491                         break;
492 #endif
493 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
494                 case NFS:
495                         nfs_start();
496                         break;
497 #endif
498 #if defined(CONFIG_CMD_CDP)
499                 case CDP:
500                         cdp_start();
501                         break;
502 #endif
503 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
504                 case NETCONS:
505                         nc_start();
506                         break;
507 #endif
508 #if defined(CONFIG_CMD_DNS)
509                 case DNS:
510                         dns_start();
511                         break;
512 #endif
513 #if defined(CONFIG_CMD_LINK_LOCAL)
514                 case LINKLOCAL:
515                         link_local_start();
516                         break;
517 #endif
518 #if defined(CONFIG_CMD_WOL)
519                 case WOL:
520                         wol_start();
521                         break;
522 #endif
523                 default:
524                         break;
525                 }
526
527                 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
528                         udp_start();
529
530                 break;
531         }
532
533 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
534 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
535         defined(CONFIG_LED_STATUS)                      && \
536         defined(CONFIG_LED_STATUS_RED)
537         /*
538          * Echo the inverted link state to the fault LED.
539          */
540         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
541                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
542         else
543                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
544 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
545 #endif /* CONFIG_MII, ... */
546 #ifdef CONFIG_USB_KEYBOARD
547         net_busy_flag = 1;
548 #endif
549
550         /*
551          *      Main packet reception loop.  Loop receiving packets until
552          *      someone sets `net_state' to a state that terminates.
553          */
554         for (;;) {
555                 WATCHDOG_RESET();
556                 if (arp_timeout_check() > 0)
557                         time_start = get_timer(0);
558
559                 /*
560                  *      Check the ethernet for a new packet.  The ethernet
561                  *      receive routine will process it.
562                  *      Most drivers return the most recent packet size, but not
563                  *      errors that may have happened.
564                  */
565                 eth_rx();
566
567                 /*
568                  *      Abort if ctrl-c was pressed.
569                  */
570                 if (ctrlc()) {
571                         /* cancel any ARP that may not have completed */
572                         net_arp_wait_packet_ip.s_addr = 0;
573
574                         net_cleanup_loop();
575                         eth_halt();
576                         /* Invalidate the last protocol */
577                         eth_set_last_protocol(BOOTP);
578
579                         puts("\nAbort\n");
580                         /* include a debug print as well incase the debug
581                            messages are directed to stderr */
582                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
583                         ret = -EINTR;
584                         goto done;
585                 }
586
587                 /*
588                  *      Check for a timeout, and run the timeout handler
589                  *      if we have one.
590                  */
591                 if (time_handler &&
592                     ((get_timer(0) - time_start) > time_delta)) {
593                         thand_f *x;
594
595 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
596 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
597         defined(CONFIG_LED_STATUS)                      && \
598         defined(CONFIG_LED_STATUS_RED)
599                         /*
600                          * Echo the inverted link state to the fault LED.
601                          */
602                         if (miiphy_link(eth_get_dev()->name,
603                                         CONFIG_SYS_FAULT_MII_ADDR))
604                                 status_led_set(CONFIG_LED_STATUS_RED,
605                                                CONFIG_LED_STATUS_OFF);
606                         else
607                                 status_led_set(CONFIG_LED_STATUS_RED,
608                                                CONFIG_LED_STATUS_ON);
609 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
610 #endif /* CONFIG_MII, ... */
611                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
612                         x = time_handler;
613                         time_handler = (thand_f *)0;
614                         (*x)();
615                 }
616
617                 if (net_state == NETLOOP_FAIL)
618                         ret = net_start_again();
619
620                 switch (net_state) {
621                 case NETLOOP_RESTART:
622                         net_restarted = 1;
623                         goto restart;
624
625                 case NETLOOP_SUCCESS:
626                         net_cleanup_loop();
627                         if (net_boot_file_size > 0) {
628                                 printf("Bytes transferred = %d (%x hex)\n",
629                                        net_boot_file_size, net_boot_file_size);
630                                 env_set_hex("filesize", net_boot_file_size);
631                                 env_set_hex("fileaddr", image_load_addr);
632                         }
633                         if (protocol != NETCONS)
634                                 eth_halt();
635                         else
636                                 eth_halt_state_only();
637
638                         eth_set_last_protocol(protocol);
639
640                         ret = net_boot_file_size;
641                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
642                         goto done;
643
644                 case NETLOOP_FAIL:
645                         net_cleanup_loop();
646                         /* Invalidate the last protocol */
647                         eth_set_last_protocol(BOOTP);
648                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
649                         ret = -ENONET;
650                         goto done;
651
652                 case NETLOOP_CONTINUE:
653                         continue;
654                 }
655         }
656
657 done:
658 #ifdef CONFIG_USB_KEYBOARD
659         net_busy_flag = 0;
660 #endif
661 #ifdef CONFIG_CMD_TFTPPUT
662         /* Clear out the handlers */
663         net_set_udp_handler(NULL);
664         net_set_icmp_handler(NULL);
665 #endif
666         net_set_state(prev_net_state);
667
668 #if defined(CONFIG_CMD_PCAP)
669         if (pcap_active())
670                 pcap_print_status();
671 #endif
672         return ret;
673 }
674
675 /**********************************************************************/
676
677 static void start_again_timeout_handler(void)
678 {
679         net_set_state(NETLOOP_RESTART);
680 }
681
682 int net_start_again(void)
683 {
684         char *nretry;
685         int retry_forever = 0;
686         unsigned long retrycnt = 0;
687         int ret;
688
689         nretry = env_get("netretry");
690         if (nretry) {
691                 if (!strcmp(nretry, "yes"))
692                         retry_forever = 1;
693                 else if (!strcmp(nretry, "no"))
694                         retrycnt = 0;
695                 else if (!strcmp(nretry, "once"))
696                         retrycnt = 1;
697                 else
698                         retrycnt = simple_strtoul(nretry, NULL, 0);
699         } else {
700                 retrycnt = 0;
701                 retry_forever = 0;
702         }
703
704         if ((!retry_forever) && (net_try_count > retrycnt)) {
705                 eth_halt();
706                 net_set_state(NETLOOP_FAIL);
707                 /*
708                  * We don't provide a way for the protocol to return an error,
709                  * but this is almost always the reason.
710                  */
711                 return -ETIMEDOUT;
712         }
713
714         net_try_count++;
715
716         eth_halt();
717 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
718         eth_try_another(!net_restarted);
719 #endif
720         ret = eth_init();
721         if (net_restart_wrap) {
722                 net_restart_wrap = 0;
723                 if (net_dev_exists) {
724                         net_set_timeout_handler(10000UL,
725                                                 start_again_timeout_handler);
726                         net_set_udp_handler(NULL);
727                 } else {
728                         net_set_state(NETLOOP_FAIL);
729                 }
730         } else {
731                 net_set_state(NETLOOP_RESTART);
732         }
733         return ret;
734 }
735
736 /**********************************************************************/
737 /*
738  *      Miscelaneous bits.
739  */
740
741 static void dummy_handler(uchar *pkt, unsigned dport,
742                         struct in_addr sip, unsigned sport,
743                         unsigned len)
744 {
745 }
746
747 rxhand_f *net_get_udp_handler(void)
748 {
749         return udp_packet_handler;
750 }
751
752 void net_set_udp_handler(rxhand_f *f)
753 {
754         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
755         if (f == NULL)
756                 udp_packet_handler = dummy_handler;
757         else
758                 udp_packet_handler = f;
759 }
760
761 rxhand_f *net_get_arp_handler(void)
762 {
763         return arp_packet_handler;
764 }
765
766 void net_set_arp_handler(rxhand_f *f)
767 {
768         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
769         if (f == NULL)
770                 arp_packet_handler = dummy_handler;
771         else
772                 arp_packet_handler = f;
773 }
774
775 #ifdef CONFIG_CMD_TFTPPUT
776 void net_set_icmp_handler(rxhand_icmp_f *f)
777 {
778         packet_icmp_handler = f;
779 }
780 #endif
781
782 void net_set_timeout_handler(ulong iv, thand_f *f)
783 {
784         if (iv == 0) {
785                 debug_cond(DEBUG_INT_STATE,
786                            "--- net_loop timeout handler cancelled\n");
787                 time_handler = (thand_f *)0;
788         } else {
789                 debug_cond(DEBUG_INT_STATE,
790                            "--- net_loop timeout handler set (%p)\n", f);
791                 time_handler = f;
792                 time_start = get_timer(0);
793                 time_delta = iv * CONFIG_SYS_HZ / 1000;
794         }
795 }
796
797 uchar *net_get_async_tx_pkt_buf(void)
798 {
799         if (arp_is_waiting())
800                 return arp_tx_packet; /* If we are waiting, we already sent */
801         else
802                 return net_tx_packet;
803 }
804
805 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
806                 int payload_len)
807 {
808         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
809                                   IPPROTO_UDP, 0, 0, 0);
810 }
811
812 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
813                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
814                        u32 tcp_ack_num)
815 {
816         uchar *pkt;
817         int eth_hdr_size;
818         int pkt_hdr_size;
819
820         /* make sure the net_tx_packet is initialized (net_init() was called) */
821         assert(net_tx_packet != NULL);
822         if (net_tx_packet == NULL)
823                 return -1;
824
825         /* convert to new style broadcast */
826         if (dest.s_addr == 0)
827                 dest.s_addr = 0xFFFFFFFF;
828
829         /* if broadcast, make the ether address a broadcast and don't do ARP */
830         if (dest.s_addr == 0xFFFFFFFF)
831                 ether = (uchar *)net_bcast_ethaddr;
832
833         pkt = (uchar *)net_tx_packet;
834
835         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
836
837         switch (proto) {
838         case IPPROTO_UDP:
839                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
840                                    payload_len);
841                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
842                 break;
843         default:
844                 return -EINVAL;
845         }
846
847         /* if MAC address was not discovered yet, do an ARP request */
848         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
849                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
850
851                 /* save the ip and eth addr for the packet to send after arp */
852                 net_arp_wait_packet_ip = dest;
853                 arp_wait_packet_ethaddr = ether;
854
855                 /* size of the waiting packet */
856                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
857
858                 /* and do the ARP request */
859                 arp_wait_try = 1;
860                 arp_wait_timer_start = get_timer(0);
861                 arp_request();
862                 return 1;       /* waiting */
863         } else {
864                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
865                            &dest, ether);
866                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
867                 return 0;       /* transmitted */
868         }
869 }
870
871 #ifdef CONFIG_IP_DEFRAG
872 /*
873  * This function collects fragments in a single packet, according
874  * to the algorithm in RFC815. It returns NULL or the pointer to
875  * a complete packet, in static storage
876  */
877 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
878
879 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
880
881 /*
882  * this is the packet being assembled, either data or frag control.
883  * Fragments go by 8 bytes, so this union must be 8 bytes long
884  */
885 struct hole {
886         /* first_byte is address of this structure */
887         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
888         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
889         u16 prev_hole;  /* index of prev, 0 == none */
890         u16 unused;
891 };
892
893 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
894 {
895         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
896         static u16 first_hole, total_len;
897         struct hole *payload, *thisfrag, *h, *newh;
898         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
899         uchar *indata = (uchar *)ip;
900         int offset8, start, len, done = 0;
901         u16 ip_off = ntohs(ip->ip_off);
902
903         /* payload starts after IP header, this fragment is in there */
904         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
905         offset8 =  (ip_off & IP_OFFS);
906         thisfrag = payload + offset8;
907         start = offset8 * 8;
908         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
909
910         if (start + len > IP_MAXUDP) /* fragment extends too far */
911                 return NULL;
912
913         if (!total_len || localip->ip_id != ip->ip_id) {
914                 /* new (or different) packet, reset structs */
915                 total_len = 0xffff;
916                 payload[0].last_byte = ~0;
917                 payload[0].next_hole = 0;
918                 payload[0].prev_hole = 0;
919                 first_hole = 0;
920                 /* any IP header will work, copy the first we received */
921                 memcpy(localip, ip, IP_HDR_SIZE);
922         }
923
924         /*
925          * What follows is the reassembly algorithm. We use the payload
926          * array as a linked list of hole descriptors, as each hole starts
927          * at a multiple of 8 bytes. However, last byte can be whatever value,
928          * so it is represented as byte count, not as 8-byte blocks.
929          */
930
931         h = payload + first_hole;
932         while (h->last_byte < start) {
933                 if (!h->next_hole) {
934                         /* no hole that far away */
935                         return NULL;
936                 }
937                 h = payload + h->next_hole;
938         }
939
940         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
941         if (offset8 + ((len + 7) / 8) <= h - payload) {
942                 /* no overlap with holes (dup fragment?) */
943                 return NULL;
944         }
945
946         if (!(ip_off & IP_FLAGS_MFRAG)) {
947                 /* no more fragmentss: truncate this (last) hole */
948                 total_len = start + len;
949                 h->last_byte = start + len;
950         }
951
952         /*
953          * There is some overlap: fix the hole list. This code doesn't
954          * deal with a fragment that overlaps with two different holes
955          * (thus being a superset of a previously-received fragment).
956          */
957
958         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
959                 /* complete overlap with hole: remove hole */
960                 if (!h->prev_hole && !h->next_hole) {
961                         /* last remaining hole */
962                         done = 1;
963                 } else if (!h->prev_hole) {
964                         /* first hole */
965                         first_hole = h->next_hole;
966                         payload[h->next_hole].prev_hole = 0;
967                 } else if (!h->next_hole) {
968                         /* last hole */
969                         payload[h->prev_hole].next_hole = 0;
970                 } else {
971                         /* in the middle of the list */
972                         payload[h->next_hole].prev_hole = h->prev_hole;
973                         payload[h->prev_hole].next_hole = h->next_hole;
974                 }
975
976         } else if (h->last_byte <= start + len) {
977                 /* overlaps with final part of the hole: shorten this hole */
978                 h->last_byte = start;
979
980         } else if (h >= thisfrag) {
981                 /* overlaps with initial part of the hole: move this hole */
982                 newh = thisfrag + (len / 8);
983                 *newh = *h;
984                 h = newh;
985                 if (h->next_hole)
986                         payload[h->next_hole].prev_hole = (h - payload);
987                 if (h->prev_hole)
988                         payload[h->prev_hole].next_hole = (h - payload);
989                 else
990                         first_hole = (h - payload);
991
992         } else {
993                 /* fragment sits in the middle: split the hole */
994                 newh = thisfrag + (len / 8);
995                 *newh = *h;
996                 h->last_byte = start;
997                 h->next_hole = (newh - payload);
998                 newh->prev_hole = (h - payload);
999                 if (newh->next_hole)
1000                         payload[newh->next_hole].prev_hole = (newh - payload);
1001         }
1002
1003         /* finally copy this fragment and possibly return whole packet */
1004         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1005         if (!done)
1006                 return NULL;
1007
1008         localip->ip_len = htons(total_len);
1009         *lenp = total_len + IP_HDR_SIZE;
1010         return localip;
1011 }
1012
1013 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1014         int *lenp)
1015 {
1016         u16 ip_off = ntohs(ip->ip_off);
1017         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1018                 return ip; /* not a fragment */
1019         return __net_defragment(ip, lenp);
1020 }
1021
1022 #else /* !CONFIG_IP_DEFRAG */
1023
1024 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1025         int *lenp)
1026 {
1027         u16 ip_off = ntohs(ip->ip_off);
1028         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1029                 return ip; /* not a fragment */
1030         return NULL;
1031 }
1032 #endif
1033
1034 /**
1035  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1036  * drop others.
1037  *
1038  * @parma ip    IP packet containing the ICMP
1039  */
1040 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1041                         struct in_addr src_ip, struct ethernet_hdr *et)
1042 {
1043         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1044
1045         switch (icmph->type) {
1046         case ICMP_REDIRECT:
1047                 if (icmph->code != ICMP_REDIR_HOST)
1048                         return;
1049                 printf(" ICMP Host Redirect to %pI4 ",
1050                        &icmph->un.gateway);
1051                 break;
1052         default:
1053 #if defined(CONFIG_CMD_PING)
1054                 ping_receive(et, ip, len);
1055 #endif
1056 #ifdef CONFIG_CMD_TFTPPUT
1057                 if (packet_icmp_handler)
1058                         packet_icmp_handler(icmph->type, icmph->code,
1059                                             ntohs(ip->udp_dst), src_ip,
1060                                             ntohs(ip->udp_src), icmph->un.data,
1061                                             ntohs(ip->udp_len));
1062 #endif
1063                 break;
1064         }
1065 }
1066
1067 void net_process_received_packet(uchar *in_packet, int len)
1068 {
1069         struct ethernet_hdr *et;
1070         struct ip_udp_hdr *ip;
1071         struct in_addr dst_ip;
1072         struct in_addr src_ip;
1073         int eth_proto;
1074 #if defined(CONFIG_CMD_CDP)
1075         int iscdp;
1076 #endif
1077         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1078
1079         debug_cond(DEBUG_NET_PKT, "packet received\n");
1080
1081 #if defined(CONFIG_CMD_PCAP)
1082         pcap_post(in_packet, len, false);
1083 #endif
1084         net_rx_packet = in_packet;
1085         net_rx_packet_len = len;
1086         et = (struct ethernet_hdr *)in_packet;
1087
1088         /* too small packet? */
1089         if (len < ETHER_HDR_SIZE)
1090                 return;
1091
1092 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1093         if (push_packet) {
1094                 (*push_packet)(in_packet, len);
1095                 return;
1096         }
1097 #endif
1098
1099 #if defined(CONFIG_CMD_CDP)
1100         /* keep track if packet is CDP */
1101         iscdp = is_cdp_packet(et->et_dest);
1102 #endif
1103
1104         myvlanid = ntohs(net_our_vlan);
1105         if (myvlanid == (ushort)-1)
1106                 myvlanid = VLAN_NONE;
1107         mynvlanid = ntohs(net_native_vlan);
1108         if (mynvlanid == (ushort)-1)
1109                 mynvlanid = VLAN_NONE;
1110
1111         eth_proto = ntohs(et->et_protlen);
1112
1113         if (eth_proto < 1514) {
1114                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1115                 /*
1116                  *      Got a 802.2 packet.  Check the other protocol field.
1117                  *      XXX VLAN over 802.2+SNAP not implemented!
1118                  */
1119                 eth_proto = ntohs(et802->et_prot);
1120
1121                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1122                 len -= E802_HDR_SIZE;
1123
1124         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1125                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1126                 len -= ETHER_HDR_SIZE;
1127
1128         } else {                        /* VLAN packet */
1129                 struct vlan_ethernet_hdr *vet =
1130                         (struct vlan_ethernet_hdr *)et;
1131
1132                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1133
1134                 /* too small packet? */
1135                 if (len < VLAN_ETHER_HDR_SIZE)
1136                         return;
1137
1138                 /* if no VLAN active */
1139                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1140 #if defined(CONFIG_CMD_CDP)
1141                                 && iscdp == 0
1142 #endif
1143                                 )
1144                         return;
1145
1146                 cti = ntohs(vet->vet_tag);
1147                 vlanid = cti & VLAN_IDMASK;
1148                 eth_proto = ntohs(vet->vet_type);
1149
1150                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1151                 len -= VLAN_ETHER_HDR_SIZE;
1152         }
1153
1154         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1155
1156 #if defined(CONFIG_CMD_CDP)
1157         if (iscdp) {
1158                 cdp_receive((uchar *)ip, len);
1159                 return;
1160         }
1161 #endif
1162
1163         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1164                 if (vlanid == VLAN_NONE)
1165                         vlanid = (mynvlanid & VLAN_IDMASK);
1166                 /* not matched? */
1167                 if (vlanid != (myvlanid & VLAN_IDMASK))
1168                         return;
1169         }
1170
1171         switch (eth_proto) {
1172         case PROT_ARP:
1173                 arp_receive(et, ip, len);
1174                 break;
1175
1176 #ifdef CONFIG_CMD_RARP
1177         case PROT_RARP:
1178                 rarp_receive(ip, len);
1179                 break;
1180 #endif
1181         case PROT_IP:
1182                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1183                 /* Before we start poking the header, make sure it is there */
1184                 if (len < IP_UDP_HDR_SIZE) {
1185                         debug("len bad %d < %lu\n", len,
1186                               (ulong)IP_UDP_HDR_SIZE);
1187                         return;
1188                 }
1189                 /* Check the packet length */
1190                 if (len < ntohs(ip->ip_len)) {
1191                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1192                         return;
1193                 }
1194                 len = ntohs(ip->ip_len);
1195                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1196                            len, ip->ip_hl_v & 0xff);
1197
1198                 /* Can't deal with anything except IPv4 */
1199                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1200                         return;
1201                 /* Can't deal with IP options (headers != 20 bytes) */
1202                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1203                         return;
1204                 /* Check the Checksum of the header */
1205                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1206                         debug("checksum bad\n");
1207                         return;
1208                 }
1209                 /* If it is not for us, ignore it */
1210                 dst_ip = net_read_ip(&ip->ip_dst);
1211                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1212                     dst_ip.s_addr != 0xFFFFFFFF) {
1213                                 return;
1214                 }
1215                 /* Read source IP address for later use */
1216                 src_ip = net_read_ip(&ip->ip_src);
1217                 /*
1218                  * The function returns the unchanged packet if it's not
1219                  * a fragment, and either the complete packet or NULL if
1220                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1221                  */
1222                 ip = net_defragment(ip, &len);
1223                 if (!ip)
1224                         return;
1225                 /*
1226                  * watch for ICMP host redirects
1227                  *
1228                  * There is no real handler code (yet). We just watch
1229                  * for ICMP host redirect messages. In case anybody
1230                  * sees these messages: please contact me
1231                  * (wd@denx.de), or - even better - send me the
1232                  * necessary fixes :-)
1233                  *
1234                  * Note: in all cases where I have seen this so far
1235                  * it was a problem with the router configuration,
1236                  * for instance when a router was configured in the
1237                  * BOOTP reply, but the TFTP server was on the same
1238                  * subnet. So this is probably a warning that your
1239                  * configuration might be wrong. But I'm not really
1240                  * sure if there aren't any other situations.
1241                  *
1242                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1243                  * we send a tftp packet to a dead connection, or when
1244                  * there is no server at the other end.
1245                  */
1246                 if (ip->ip_p == IPPROTO_ICMP) {
1247                         receive_icmp(ip, len, src_ip, et);
1248                         return;
1249                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1250                         return;
1251                 }
1252
1253                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len))
1254                         return;
1255
1256                 debug_cond(DEBUG_DEV_PKT,
1257                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1258                            &dst_ip, &src_ip, len);
1259
1260 #ifdef CONFIG_UDP_CHECKSUM
1261                 if (ip->udp_xsum != 0) {
1262                         ulong   xsum;
1263                         u8 *sumptr;
1264                         ushort  sumlen;
1265
1266                         xsum  = ip->ip_p;
1267                         xsum += (ntohs(ip->udp_len));
1268                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1269                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1270                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1271                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1272
1273                         sumlen = ntohs(ip->udp_len);
1274                         sumptr = (u8 *)&ip->udp_src;
1275
1276                         while (sumlen > 1) {
1277                                 /* inlined ntohs() to avoid alignment errors */
1278                                 xsum += (sumptr[0] << 8) + sumptr[1];
1279                                 sumptr += 2;
1280                                 sumlen -= 2;
1281                         }
1282                         if (sumlen > 0)
1283                                 xsum += (sumptr[0] << 8) + sumptr[0];
1284                         while ((xsum >> 16) != 0) {
1285                                 xsum = (xsum & 0x0000ffff) +
1286                                        ((xsum >> 16) & 0x0000ffff);
1287                         }
1288                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1289                                 printf(" UDP wrong checksum %08lx %08x\n",
1290                                        xsum, ntohs(ip->udp_xsum));
1291                                 return;
1292                         }
1293                 }
1294 #endif
1295
1296 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1297                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1298                                 src_ip,
1299                                 ntohs(ip->udp_dst),
1300                                 ntohs(ip->udp_src),
1301                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1302 #endif
1303                 /*
1304                  * IP header OK.  Pass the packet to the current handler.
1305                  */
1306                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1307                                       ntohs(ip->udp_dst),
1308                                       src_ip,
1309                                       ntohs(ip->udp_src),
1310                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1311                 break;
1312 #ifdef CONFIG_CMD_WOL
1313         case PROT_WOL:
1314                 wol_receive(ip, len);
1315                 break;
1316 #endif
1317         }
1318 }
1319
1320 /**********************************************************************/
1321
1322 static int net_check_prereq(enum proto_t protocol)
1323 {
1324         switch (protocol) {
1325                 /* Fall through */
1326 #if defined(CONFIG_CMD_PING)
1327         case PING:
1328                 if (net_ping_ip.s_addr == 0) {
1329                         puts("*** ERROR: ping address not given\n");
1330                         return 1;
1331                 }
1332                 goto common;
1333 #endif
1334 #if defined(CONFIG_CMD_DNS)
1335         case DNS:
1336                 if (net_dns_server.s_addr == 0) {
1337                         puts("*** ERROR: DNS server address not given\n");
1338                         return 1;
1339                 }
1340                 goto common;
1341 #endif
1342 #if defined(CONFIG_PROT_UDP)
1343         case UDP:
1344                 if (udp_prereq())
1345                         return 1;
1346                 goto common;
1347 #endif
1348
1349 #if defined(CONFIG_CMD_NFS)
1350         case NFS:
1351 #endif
1352                 /* Fall through */
1353         case TFTPGET:
1354         case TFTPPUT:
1355                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1356                         puts("*** ERROR: `serverip' not set\n");
1357                         return 1;
1358                 }
1359 #if     defined(CONFIG_CMD_PING) || \
1360         defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1361 common:
1362 #endif
1363                 /* Fall through */
1364
1365         case NETCONS:
1366         case FASTBOOT:
1367         case TFTPSRV:
1368                 if (net_ip.s_addr == 0) {
1369                         puts("*** ERROR: `ipaddr' not set\n");
1370                         return 1;
1371                 }
1372                 /* Fall through */
1373
1374 #ifdef CONFIG_CMD_RARP
1375         case RARP:
1376 #endif
1377         case BOOTP:
1378         case CDP:
1379         case DHCP:
1380         case LINKLOCAL:
1381                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1382                         int num = eth_get_dev_index();
1383
1384                         switch (num) {
1385                         case -1:
1386                                 puts("*** ERROR: No ethernet found.\n");
1387                                 return 1;
1388                         case 0:
1389                                 puts("*** ERROR: `ethaddr' not set\n");
1390                                 break;
1391                         default:
1392                                 printf("*** ERROR: `eth%daddr' not set\n",
1393                                        num);
1394                                 break;
1395                         }
1396
1397                         net_start_again();
1398                         return 2;
1399                 }
1400                 /* Fall through */
1401         default:
1402                 return 0;
1403         }
1404         return 0;               /* OK */
1405 }
1406 /**********************************************************************/
1407
1408 int
1409 net_eth_hdr_size(void)
1410 {
1411         ushort myvlanid;
1412
1413         myvlanid = ntohs(net_our_vlan);
1414         if (myvlanid == (ushort)-1)
1415                 myvlanid = VLAN_NONE;
1416
1417         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1418                 VLAN_ETHER_HDR_SIZE;
1419 }
1420
1421 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1422 {
1423         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1424         ushort myvlanid;
1425
1426         myvlanid = ntohs(net_our_vlan);
1427         if (myvlanid == (ushort)-1)
1428                 myvlanid = VLAN_NONE;
1429
1430         memcpy(et->et_dest, dest_ethaddr, 6);
1431         memcpy(et->et_src, net_ethaddr, 6);
1432         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1433                 et->et_protlen = htons(prot);
1434                 return ETHER_HDR_SIZE;
1435         } else {
1436                 struct vlan_ethernet_hdr *vet =
1437                         (struct vlan_ethernet_hdr *)xet;
1438
1439                 vet->vet_vlan_type = htons(PROT_VLAN);
1440                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1441                 vet->vet_type = htons(prot);
1442                 return VLAN_ETHER_HDR_SIZE;
1443         }
1444 }
1445
1446 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1447 {
1448         ushort protlen;
1449
1450         memcpy(et->et_dest, addr, 6);
1451         memcpy(et->et_src, net_ethaddr, 6);
1452         protlen = ntohs(et->et_protlen);
1453         if (protlen == PROT_VLAN) {
1454                 struct vlan_ethernet_hdr *vet =
1455                         (struct vlan_ethernet_hdr *)et;
1456                 vet->vet_type = htons(prot);
1457                 return VLAN_ETHER_HDR_SIZE;
1458         } else if (protlen > 1514) {
1459                 et->et_protlen = htons(prot);
1460                 return ETHER_HDR_SIZE;
1461         } else {
1462                 /* 802.2 + SNAP */
1463                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1464                 et802->et_prot = htons(prot);
1465                 return E802_HDR_SIZE;
1466         }
1467 }
1468
1469 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1470                        u16 pkt_len, u8 proto)
1471 {
1472         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1473
1474         /*
1475          *      Construct an IP header.
1476          */
1477         /* IP_HDR_SIZE / 4 (not including UDP) */
1478         ip->ip_hl_v  = 0x45;
1479         ip->ip_tos   = 0;
1480         ip->ip_len   = htons(pkt_len);
1481         ip->ip_p     = proto;
1482         ip->ip_id    = htons(net_ip_id++);
1483         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1484         ip->ip_ttl   = 255;
1485         ip->ip_sum   = 0;
1486         /* already in network byte order */
1487         net_copy_ip((void *)&ip->ip_src, &source);
1488         /* already in network byte order */
1489         net_copy_ip((void *)&ip->ip_dst, &dest);
1490
1491         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1492 }
1493
1494 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1495                         int len)
1496 {
1497         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1498
1499         /*
1500          *      If the data is an odd number of bytes, zero the
1501          *      byte after the last byte so that the checksum
1502          *      will work.
1503          */
1504         if (len & 1)
1505                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1506
1507         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1508                           IPPROTO_UDP);
1509
1510         ip->udp_src  = htons(sport);
1511         ip->udp_dst  = htons(dport);
1512         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1513         ip->udp_xsum = 0;
1514 }
1515
1516 void copy_filename(char *dst, const char *src, int size)
1517 {
1518         if (src && *src && (*src == '"')) {
1519                 ++src;
1520                 --size;
1521         }
1522
1523         while ((--size > 0) && src && *src && (*src != '"'))
1524                 *dst++ = *src++;
1525         *dst = '\0';
1526 }
1527
1528 int is_serverip_in_cmd(void)
1529 {
1530         return !!strchr(net_boot_file_name, ':');
1531 }
1532
1533 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1534 {
1535         char *colon;
1536
1537         if (net_boot_file_name[0] == '\0')
1538                 return 0;
1539
1540         colon = strchr(net_boot_file_name, ':');
1541         if (colon) {
1542                 if (ipaddr)
1543                         *ipaddr = string_to_ip(net_boot_file_name);
1544                 strncpy(filename, colon + 1, max_len);
1545         } else {
1546                 strncpy(filename, net_boot_file_name, max_len);
1547         }
1548         filename[max_len - 1] = '\0';
1549
1550         return 1;
1551 }
1552
1553 void ip_to_string(struct in_addr x, char *s)
1554 {
1555         x.s_addr = ntohl(x.s_addr);
1556         sprintf(s, "%d.%d.%d.%d",
1557                 (int) ((x.s_addr >> 24) & 0xff),
1558                 (int) ((x.s_addr >> 16) & 0xff),
1559                 (int) ((x.s_addr >> 8) & 0xff),
1560                 (int) ((x.s_addr >> 0) & 0xff)
1561         );
1562 }
1563
1564 void vlan_to_string(ushort x, char *s)
1565 {
1566         x = ntohs(x);
1567
1568         if (x == (ushort)-1)
1569                 x = VLAN_NONE;
1570
1571         if (x == VLAN_NONE)
1572                 strcpy(s, "none");
1573         else
1574                 sprintf(s, "%d", x & VLAN_IDMASK);
1575 }
1576
1577 ushort string_to_vlan(const char *s)
1578 {
1579         ushort id;
1580
1581         if (s == NULL)
1582                 return htons(VLAN_NONE);
1583
1584         if (*s < '0' || *s > '9')
1585                 id = VLAN_NONE;
1586         else
1587                 id = (ushort)simple_strtoul(s, NULL, 10);
1588
1589         return htons(id);
1590 }
1591
1592 ushort env_get_vlan(char *var)
1593 {
1594         return string_to_vlan(env_get(var));
1595 }