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