Merge git://git.denx.de/u-boot-dm
[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  * SNTP:
76  *
77  *      Prerequisites:  - own ethernet address
78  *                      - own IP address
79  *      We want:        - network time
80  *      Next step:      none
81  *
82  * WOL:
83  *
84  *      Prerequisites:  - own ethernet address
85  *      We want:        - magic packet or timeout
86  *      Next step:      none
87  */
88
89
90 #include <common.h>
91 #include <command.h>
92 #include <console.h>
93 #include <environment.h>
94 #include <errno.h>
95 #include <net.h>
96 #include <net/fastboot.h>
97 #include <net/tftp.h>
98 #if defined(CONFIG_LED_STATUS)
99 #include <miiphy.h>
100 #include <status_led.h>
101 #endif
102 #include <watchdog.h>
103 #include <linux/compiler.h>
104 #include "arp.h"
105 #include "bootp.h"
106 #include "cdp.h"
107 #if defined(CONFIG_CMD_DNS)
108 #include "dns.h"
109 #endif
110 #include "link_local.h"
111 #include "nfs.h"
112 #include "ping.h"
113 #include "rarp.h"
114 #if defined(CONFIG_CMD_SNTP)
115 #include "sntp.h"
116 #endif
117 #if defined(CONFIG_CMD_WOL)
118 #include "wol.h"
119 #endif
120
121 /** BOOTP EXTENTIONS **/
122
123 /* Our subnet mask (0=unknown) */
124 struct in_addr net_netmask;
125 /* Our gateways IP address */
126 struct in_addr net_gateway;
127 /* Our DNS IP address */
128 struct in_addr net_dns_server;
129 #if defined(CONFIG_BOOTP_DNS2)
130 /* Our 2nd DNS IP address */
131 struct in_addr net_dns_server2;
132 #endif
133
134 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
135 struct in_addr net_mcast_addr;
136 #endif
137
138 /** END OF BOOTP EXTENTIONS **/
139
140 /* Our ethernet address */
141 u8 net_ethaddr[6];
142 /* Boot server enet address */
143 u8 net_server_ethaddr[6];
144 /* Our IP addr (0 = unknown) */
145 struct in_addr  net_ip;
146 /* Server IP addr (0 = unknown) */
147 struct in_addr  net_server_ip;
148 /* Current receive packet */
149 uchar *net_rx_packet;
150 /* Current rx packet length */
151 int             net_rx_packet_len;
152 /* IP packet ID */
153 static unsigned net_ip_id;
154 /* Ethernet bcast address */
155 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
156 const u8 net_null_ethaddr[6];
157 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
158 void (*push_packet)(void *, int len) = 0;
159 #endif
160 /* Network loop state */
161 enum net_loop_state net_state;
162 /* Tried all network devices */
163 int             net_restart_wrap;
164 /* Network loop restarted */
165 static int      net_restarted;
166 /* At least one device configured */
167 static int      net_dev_exists;
168
169 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
170 /* default is without VLAN */
171 ushort          net_our_vlan = 0xFFFF;
172 /* ditto */
173 ushort          net_native_vlan = 0xFFFF;
174
175 /* Boot File name */
176 char net_boot_file_name[1024];
177 /* Indicates whether the file name was specified on the command line */
178 bool net_boot_file_name_explicit;
179 /* The actual transferred size of the bootfile (in bytes) */
180 u32 net_boot_file_size;
181 /* Boot file size in blocks as reported by the DHCP server */
182 u32 net_boot_file_expected_size_in_blocks;
183
184 #if defined(CONFIG_CMD_SNTP)
185 /* NTP server IP address */
186 struct in_addr  net_ntp_server;
187 /* offset time from UTC */
188 int             net_ntp_time_offset;
189 #endif
190
191 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
192 /* Receive packets */
193 uchar *net_rx_packets[PKTBUFSRX];
194 /* Current UDP RX packet handler */
195 static rxhand_f *udp_packet_handler;
196 /* Current ARP RX packet handler */
197 static rxhand_f *arp_packet_handler;
198 #ifdef CONFIG_CMD_TFTPPUT
199 /* Current ICMP rx handler */
200 static rxhand_icmp_f *packet_icmp_handler;
201 #endif
202 /* Current timeout handler */
203 static thand_f *time_handler;
204 /* Time base value */
205 static ulong    time_start;
206 /* Current timeout value */
207 static ulong    time_delta;
208 /* THE transmit packet */
209 uchar *net_tx_packet;
210
211 static int net_check_prereq(enum proto_t protocol);
212
213 static int net_try_count;
214
215 int __maybe_unused net_busy_flag;
216
217 /**********************************************************************/
218
219 static int on_ipaddr(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_ip = string_to_ip(value);
226
227         return 0;
228 }
229 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
230
231 static int on_gatewayip(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_gateway = string_to_ip(value);
238
239         return 0;
240 }
241 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
242
243 static int on_netmask(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_netmask = string_to_ip(value);
250
251         return 0;
252 }
253 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
254
255 static int on_serverip(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_server_ip = string_to_ip(value);
262
263         return 0;
264 }
265 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
266
267 static int on_nvlan(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_native_vlan = string_to_vlan(value);
274
275         return 0;
276 }
277 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
278
279 static int on_vlan(const char *name, const char *value, enum env_op op,
280         int flags)
281 {
282         if (flags & H_PROGRAMMATIC)
283                 return 0;
284
285         net_our_vlan = string_to_vlan(value);
286
287         return 0;
288 }
289 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
290
291 #if defined(CONFIG_CMD_DNS)
292 static int on_dnsip(const char *name, const char *value, enum env_op op,
293         int flags)
294 {
295         if (flags & H_PROGRAMMATIC)
296                 return 0;
297
298         net_dns_server = string_to_ip(value);
299
300         return 0;
301 }
302 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
303 #endif
304
305 /*
306  * Check if autoload is enabled. If so, use either NFS or TFTP to download
307  * the boot file.
308  */
309 void net_auto_load(void)
310 {
311 #if defined(CONFIG_CMD_NFS)
312         const char *s = env_get("autoload");
313
314         if (s != NULL && strcmp(s, "NFS") == 0) {
315                 if (net_check_prereq(NFS)) {
316 /* We aren't expecting to get a serverip, so just accept the assigned IP */
317 #ifdef CONFIG_BOOTP_SERVERIP
318                         net_set_state(NETLOOP_SUCCESS);
319 #else
320                         printf("Cannot autoload with NFS\n");
321                         net_set_state(NETLOOP_FAIL);
322 #endif
323                         return;
324                 }
325                 /*
326                  * Use NFS to load the bootfile.
327                  */
328                 nfs_start();
329                 return;
330         }
331 #endif
332         if (env_get_yesno("autoload") == 0) {
333                 /*
334                  * Just use BOOTP/RARP to configure system;
335                  * Do not use TFTP to load the bootfile.
336                  */
337                 net_set_state(NETLOOP_SUCCESS);
338                 return;
339         }
340         if (net_check_prereq(TFTPGET)) {
341 /* We aren't expecting to get a serverip, so just accept the assigned IP */
342 #ifdef CONFIG_BOOTP_SERVERIP
343                 net_set_state(NETLOOP_SUCCESS);
344 #else
345                 printf("Cannot autoload with TFTPGET\n");
346                 net_set_state(NETLOOP_FAIL);
347 #endif
348                 return;
349         }
350         tftp_start(TFTPGET);
351 }
352
353 static void net_init_loop(void)
354 {
355         if (eth_get_dev())
356                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
357
358         return;
359 }
360
361 static void net_clear_handlers(void)
362 {
363         net_set_udp_handler(NULL);
364         net_set_arp_handler(NULL);
365         net_set_timeout_handler(0, NULL);
366 }
367
368 static void net_cleanup_loop(void)
369 {
370         net_clear_handlers();
371 }
372
373 void net_init(void)
374 {
375         static int first_call = 1;
376
377         if (first_call) {
378                 /*
379                  *      Setup packet buffers, aligned correctly.
380                  */
381                 int i;
382
383                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
384                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
385                 for (i = 0; i < PKTBUFSRX; i++) {
386                         net_rx_packets[i] = net_tx_packet +
387                                 (i + 1) * PKTSIZE_ALIGN;
388                 }
389                 arp_init();
390                 net_clear_handlers();
391
392                 /* Only need to setup buffer pointers once. */
393                 first_call = 0;
394         }
395
396         net_init_loop();
397 }
398
399 /**********************************************************************/
400 /*
401  *      Main network processing loop.
402  */
403
404 int net_loop(enum proto_t protocol)
405 {
406         int ret = -EINVAL;
407         enum net_loop_state prev_net_state = net_state;
408
409         net_restarted = 0;
410         net_dev_exists = 0;
411         net_try_count = 1;
412         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
413
414         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
415         net_init();
416         if (eth_is_on_demand_init() || protocol != NETCONS) {
417                 eth_halt();
418                 eth_set_current();
419                 ret = eth_init();
420                 if (ret < 0) {
421                         eth_halt();
422                         return ret;
423                 }
424         } else {
425                 eth_init_state_only();
426         }
427 restart:
428 #ifdef CONFIG_USB_KEYBOARD
429         net_busy_flag = 0;
430 #endif
431         net_set_state(NETLOOP_CONTINUE);
432
433         /*
434          *      Start the ball rolling with the given start function.  From
435          *      here on, this code is a state machine driven by received
436          *      packets and timer events.
437          */
438         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
439         net_init_loop();
440
441         switch (net_check_prereq(protocol)) {
442         case 1:
443                 /* network not configured */
444                 eth_halt();
445                 net_set_state(prev_net_state);
446                 return -ENODEV;
447
448         case 2:
449                 /* network device not configured */
450                 break;
451
452         case 0:
453                 net_dev_exists = 1;
454                 net_boot_file_size = 0;
455                 switch (protocol) {
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 #ifdef CONFIG_CMD_TFTPSRV
464                 case TFTPSRV:
465                         tftp_start_server();
466                         break;
467 #endif
468 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
469                 case FASTBOOT:
470                         fastboot_start_server();
471                         break;
472 #endif
473 #if defined(CONFIG_CMD_DHCP)
474                 case DHCP:
475                         bootp_reset();
476                         net_ip.s_addr = 0;
477                         dhcp_request();         /* Basically same as BOOTP */
478                         break;
479 #endif
480
481                 case BOOTP:
482                         bootp_reset();
483                         net_ip.s_addr = 0;
484                         bootp_request();
485                         break;
486
487 #if defined(CONFIG_CMD_RARP)
488                 case RARP:
489                         rarp_try = 0;
490                         net_ip.s_addr = 0;
491                         rarp_request();
492                         break;
493 #endif
494 #if defined(CONFIG_CMD_PING)
495                 case PING:
496                         ping_start();
497                         break;
498 #endif
499 #if defined(CONFIG_CMD_NFS)
500                 case NFS:
501                         nfs_start();
502                         break;
503 #endif
504 #if defined(CONFIG_CMD_CDP)
505                 case CDP:
506                         cdp_start();
507                         break;
508 #endif
509 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
510                 case NETCONS:
511                         nc_start();
512                         break;
513 #endif
514 #if defined(CONFIG_CMD_SNTP)
515                 case SNTP:
516                         sntp_start();
517                         break;
518 #endif
519 #if defined(CONFIG_CMD_DNS)
520                 case DNS:
521                         dns_start();
522                         break;
523 #endif
524 #if defined(CONFIG_CMD_LINK_LOCAL)
525                 case LINKLOCAL:
526                         link_local_start();
527                         break;
528 #endif
529 #if defined(CONFIG_CMD_WOL)
530                 case WOL:
531                         wol_start();
532                         break;
533 #endif
534                 default:
535                         break;
536                 }
537
538                 break;
539         }
540
541 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
542 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
543         defined(CONFIG_LED_STATUS)                      && \
544         defined(CONFIG_LED_STATUS_RED)
545         /*
546          * Echo the inverted link state to the fault LED.
547          */
548         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
549                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
550         else
551                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
552 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
553 #endif /* CONFIG_MII, ... */
554 #ifdef CONFIG_USB_KEYBOARD
555         net_busy_flag = 1;
556 #endif
557
558         /*
559          *      Main packet reception loop.  Loop receiving packets until
560          *      someone sets `net_state' to a state that terminates.
561          */
562         for (;;) {
563                 WATCHDOG_RESET();
564 #ifdef CONFIG_SHOW_ACTIVITY
565                 show_activity(1);
566 #endif
567                 if (arp_timeout_check() > 0)
568                         time_start = get_timer(0);
569
570                 /*
571                  *      Check the ethernet for a new packet.  The ethernet
572                  *      receive routine will process it.
573                  *      Most drivers return the most recent packet size, but not
574                  *      errors that may have happened.
575                  */
576                 eth_rx();
577
578                 /*
579                  *      Abort if ctrl-c was pressed.
580                  */
581                 if (ctrlc()) {
582                         /* cancel any ARP that may not have completed */
583                         net_arp_wait_packet_ip.s_addr = 0;
584
585                         net_cleanup_loop();
586                         eth_halt();
587                         /* Invalidate the last protocol */
588                         eth_set_last_protocol(BOOTP);
589
590                         puts("\nAbort\n");
591                         /* include a debug print as well incase the debug
592                            messages are directed to stderr */
593                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
594                         ret = -EINTR;
595                         goto done;
596                 }
597
598                 /*
599                  *      Check for a timeout, and run the timeout handler
600                  *      if we have one.
601                  */
602                 if (time_handler &&
603                     ((get_timer(0) - time_start) > time_delta)) {
604                         thand_f *x;
605
606 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
607 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
608         defined(CONFIG_LED_STATUS)                      && \
609         defined(CONFIG_LED_STATUS_RED)
610                         /*
611                          * Echo the inverted link state to the fault LED.
612                          */
613                         if (miiphy_link(eth_get_dev()->name,
614                                         CONFIG_SYS_FAULT_MII_ADDR))
615                                 status_led_set(CONFIG_LED_STATUS_RED,
616                                                CONFIG_LED_STATUS_OFF);
617                         else
618                                 status_led_set(CONFIG_LED_STATUS_RED,
619                                                CONFIG_LED_STATUS_ON);
620 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
621 #endif /* CONFIG_MII, ... */
622                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
623                         x = time_handler;
624                         time_handler = (thand_f *)0;
625                         (*x)();
626                 }
627
628                 if (net_state == NETLOOP_FAIL)
629                         ret = net_start_again();
630
631                 switch (net_state) {
632                 case NETLOOP_RESTART:
633                         net_restarted = 1;
634                         goto restart;
635
636                 case NETLOOP_SUCCESS:
637                         net_cleanup_loop();
638                         if (net_boot_file_size > 0) {
639                                 printf("Bytes transferred = %d (%x hex)\n",
640                                        net_boot_file_size, net_boot_file_size);
641                                 env_set_hex("filesize", net_boot_file_size);
642                                 env_set_hex("fileaddr", load_addr);
643                         }
644                         if (protocol != NETCONS)
645                                 eth_halt();
646                         else
647                                 eth_halt_state_only();
648
649                         eth_set_last_protocol(protocol);
650
651                         ret = net_boot_file_size;
652                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
653                         goto done;
654
655                 case NETLOOP_FAIL:
656                         net_cleanup_loop();
657                         /* Invalidate the last protocol */
658                         eth_set_last_protocol(BOOTP);
659                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
660                         goto done;
661
662                 case NETLOOP_CONTINUE:
663                         continue;
664                 }
665         }
666
667 done:
668 #ifdef CONFIG_USB_KEYBOARD
669         net_busy_flag = 0;
670 #endif
671 #ifdef CONFIG_CMD_TFTPPUT
672         /* Clear out the handlers */
673         net_set_udp_handler(NULL);
674         net_set_icmp_handler(NULL);
675 #endif
676         net_set_state(prev_net_state);
677         return ret;
678 }
679
680 /**********************************************************************/
681
682 static void start_again_timeout_handler(void)
683 {
684         net_set_state(NETLOOP_RESTART);
685 }
686
687 int net_start_again(void)
688 {
689         char *nretry;
690         int retry_forever = 0;
691         unsigned long retrycnt = 0;
692         int ret;
693
694         nretry = env_get("netretry");
695         if (nretry) {
696                 if (!strcmp(nretry, "yes"))
697                         retry_forever = 1;
698                 else if (!strcmp(nretry, "no"))
699                         retrycnt = 0;
700                 else if (!strcmp(nretry, "once"))
701                         retrycnt = 1;
702                 else
703                         retrycnt = simple_strtoul(nretry, NULL, 0);
704         } else {
705                 retrycnt = 0;
706                 retry_forever = 0;
707         }
708
709         if ((!retry_forever) && (net_try_count > retrycnt)) {
710                 eth_halt();
711                 net_set_state(NETLOOP_FAIL);
712                 /*
713                  * We don't provide a way for the protocol to return an error,
714                  * but this is almost always the reason.
715                  */
716                 return -ETIMEDOUT;
717         }
718
719         net_try_count++;
720
721         eth_halt();
722 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
723         eth_try_another(!net_restarted);
724 #endif
725         ret = eth_init();
726         if (net_restart_wrap) {
727                 net_restart_wrap = 0;
728                 if (net_dev_exists) {
729                         net_set_timeout_handler(10000UL,
730                                                 start_again_timeout_handler);
731                         net_set_udp_handler(NULL);
732                 } else {
733                         net_set_state(NETLOOP_FAIL);
734                 }
735         } else {
736                 net_set_state(NETLOOP_RESTART);
737         }
738         return ret;
739 }
740
741 /**********************************************************************/
742 /*
743  *      Miscelaneous bits.
744  */
745
746 static void dummy_handler(uchar *pkt, unsigned dport,
747                         struct in_addr sip, unsigned sport,
748                         unsigned len)
749 {
750 }
751
752 rxhand_f *net_get_udp_handler(void)
753 {
754         return udp_packet_handler;
755 }
756
757 void net_set_udp_handler(rxhand_f *f)
758 {
759         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
760         if (f == NULL)
761                 udp_packet_handler = dummy_handler;
762         else
763                 udp_packet_handler = f;
764 }
765
766 rxhand_f *net_get_arp_handler(void)
767 {
768         return arp_packet_handler;
769 }
770
771 void net_set_arp_handler(rxhand_f *f)
772 {
773         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
774         if (f == NULL)
775                 arp_packet_handler = dummy_handler;
776         else
777                 arp_packet_handler = f;
778 }
779
780 #ifdef CONFIG_CMD_TFTPPUT
781 void net_set_icmp_handler(rxhand_icmp_f *f)
782 {
783         packet_icmp_handler = f;
784 }
785 #endif
786
787 void net_set_timeout_handler(ulong iv, thand_f *f)
788 {
789         if (iv == 0) {
790                 debug_cond(DEBUG_INT_STATE,
791                            "--- net_loop timeout handler cancelled\n");
792                 time_handler = (thand_f *)0;
793         } else {
794                 debug_cond(DEBUG_INT_STATE,
795                            "--- net_loop timeout handler set (%p)\n", f);
796                 time_handler = f;
797                 time_start = get_timer(0);
798                 time_delta = iv * CONFIG_SYS_HZ / 1000;
799         }
800 }
801
802 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
803                 int payload_len)
804 {
805         uchar *pkt;
806         int eth_hdr_size;
807         int pkt_hdr_size;
808
809         /* make sure the net_tx_packet is initialized (net_init() was called) */
810         assert(net_tx_packet != NULL);
811         if (net_tx_packet == NULL)
812                 return -1;
813
814         /* convert to new style broadcast */
815         if (dest.s_addr == 0)
816                 dest.s_addr = 0xFFFFFFFF;
817
818         /* if broadcast, make the ether address a broadcast and don't do ARP */
819         if (dest.s_addr == 0xFFFFFFFF)
820                 ether = (uchar *)net_bcast_ethaddr;
821
822         pkt = (uchar *)net_tx_packet;
823
824         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
825         pkt += eth_hdr_size;
826         net_set_udp_header(pkt, dest, dport, sport, payload_len);
827         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
828
829         /* if MAC address was not discovered yet, do an ARP request */
830         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
831                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
832
833                 /* save the ip and eth addr for the packet to send after arp */
834                 net_arp_wait_packet_ip = dest;
835                 arp_wait_packet_ethaddr = ether;
836
837                 /* size of the waiting packet */
838                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
839
840                 /* and do the ARP request */
841                 arp_wait_try = 1;
842                 arp_wait_timer_start = get_timer(0);
843                 arp_request();
844                 return 1;       /* waiting */
845         } else {
846                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
847                            &dest, ether);
848                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
849                 return 0;       /* transmitted */
850         }
851 }
852
853 #ifdef CONFIG_IP_DEFRAG
854 /*
855  * This function collects fragments in a single packet, according
856  * to the algorithm in RFC815. It returns NULL or the pointer to
857  * a complete packet, in static storage
858  */
859 #ifndef CONFIG_NET_MAXDEFRAG
860 #define CONFIG_NET_MAXDEFRAG 16384
861 #endif
862 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
863
864 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
865
866 /*
867  * this is the packet being assembled, either data or frag control.
868  * Fragments go by 8 bytes, so this union must be 8 bytes long
869  */
870 struct hole {
871         /* first_byte is address of this structure */
872         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
873         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
874         u16 prev_hole;  /* index of prev, 0 == none */
875         u16 unused;
876 };
877
878 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
879 {
880         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
881         static u16 first_hole, total_len;
882         struct hole *payload, *thisfrag, *h, *newh;
883         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
884         uchar *indata = (uchar *)ip;
885         int offset8, start, len, done = 0;
886         u16 ip_off = ntohs(ip->ip_off);
887
888         /* payload starts after IP header, this fragment is in there */
889         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
890         offset8 =  (ip_off & IP_OFFS);
891         thisfrag = payload + offset8;
892         start = offset8 * 8;
893         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
894
895         if (start + len > IP_MAXUDP) /* fragment extends too far */
896                 return NULL;
897
898         if (!total_len || localip->ip_id != ip->ip_id) {
899                 /* new (or different) packet, reset structs */
900                 total_len = 0xffff;
901                 payload[0].last_byte = ~0;
902                 payload[0].next_hole = 0;
903                 payload[0].prev_hole = 0;
904                 first_hole = 0;
905                 /* any IP header will work, copy the first we received */
906                 memcpy(localip, ip, IP_HDR_SIZE);
907         }
908
909         /*
910          * What follows is the reassembly algorithm. We use the payload
911          * array as a linked list of hole descriptors, as each hole starts
912          * at a multiple of 8 bytes. However, last byte can be whatever value,
913          * so it is represented as byte count, not as 8-byte blocks.
914          */
915
916         h = payload + first_hole;
917         while (h->last_byte < start) {
918                 if (!h->next_hole) {
919                         /* no hole that far away */
920                         return NULL;
921                 }
922                 h = payload + h->next_hole;
923         }
924
925         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
926         if (offset8 + ((len + 7) / 8) <= h - payload) {
927                 /* no overlap with holes (dup fragment?) */
928                 return NULL;
929         }
930
931         if (!(ip_off & IP_FLAGS_MFRAG)) {
932                 /* no more fragmentss: truncate this (last) hole */
933                 total_len = start + len;
934                 h->last_byte = start + len;
935         }
936
937         /*
938          * There is some overlap: fix the hole list. This code doesn't
939          * deal with a fragment that overlaps with two different holes
940          * (thus being a superset of a previously-received fragment).
941          */
942
943         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
944                 /* complete overlap with hole: remove hole */
945                 if (!h->prev_hole && !h->next_hole) {
946                         /* last remaining hole */
947                         done = 1;
948                 } else if (!h->prev_hole) {
949                         /* first hole */
950                         first_hole = h->next_hole;
951                         payload[h->next_hole].prev_hole = 0;
952                 } else if (!h->next_hole) {
953                         /* last hole */
954                         payload[h->prev_hole].next_hole = 0;
955                 } else {
956                         /* in the middle of the list */
957                         payload[h->next_hole].prev_hole = h->prev_hole;
958                         payload[h->prev_hole].next_hole = h->next_hole;
959                 }
960
961         } else if (h->last_byte <= start + len) {
962                 /* overlaps with final part of the hole: shorten this hole */
963                 h->last_byte = start;
964
965         } else if (h >= thisfrag) {
966                 /* overlaps with initial part of the hole: move this hole */
967                 newh = thisfrag + (len / 8);
968                 *newh = *h;
969                 h = newh;
970                 if (h->next_hole)
971                         payload[h->next_hole].prev_hole = (h - payload);
972                 if (h->prev_hole)
973                         payload[h->prev_hole].next_hole = (h - payload);
974                 else
975                         first_hole = (h - payload);
976
977         } else {
978                 /* fragment sits in the middle: split the hole */
979                 newh = thisfrag + (len / 8);
980                 *newh = *h;
981                 h->last_byte = start;
982                 h->next_hole = (newh - payload);
983                 newh->prev_hole = (h - payload);
984                 if (newh->next_hole)
985                         payload[newh->next_hole].prev_hole = (newh - payload);
986         }
987
988         /* finally copy this fragment and possibly return whole packet */
989         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
990         if (!done)
991                 return NULL;
992
993         localip->ip_len = htons(total_len);
994         *lenp = total_len + IP_HDR_SIZE;
995         return localip;
996 }
997
998 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
999         int *lenp)
1000 {
1001         u16 ip_off = ntohs(ip->ip_off);
1002         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1003                 return ip; /* not a fragment */
1004         return __net_defragment(ip, lenp);
1005 }
1006
1007 #else /* !CONFIG_IP_DEFRAG */
1008
1009 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1010         int *lenp)
1011 {
1012         u16 ip_off = ntohs(ip->ip_off);
1013         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1014                 return ip; /* not a fragment */
1015         return NULL;
1016 }
1017 #endif
1018
1019 /**
1020  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1021  * drop others.
1022  *
1023  * @parma ip    IP packet containing the ICMP
1024  */
1025 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1026                         struct in_addr src_ip, struct ethernet_hdr *et)
1027 {
1028         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1029
1030         switch (icmph->type) {
1031         case ICMP_REDIRECT:
1032                 if (icmph->code != ICMP_REDIR_HOST)
1033                         return;
1034                 printf(" ICMP Host Redirect to %pI4 ",
1035                        &icmph->un.gateway);
1036                 break;
1037         default:
1038 #if defined(CONFIG_CMD_PING)
1039                 ping_receive(et, ip, len);
1040 #endif
1041 #ifdef CONFIG_CMD_TFTPPUT
1042                 if (packet_icmp_handler)
1043                         packet_icmp_handler(icmph->type, icmph->code,
1044                                             ntohs(ip->udp_dst), src_ip,
1045                                             ntohs(ip->udp_src), icmph->un.data,
1046                                             ntohs(ip->udp_len));
1047 #endif
1048                 break;
1049         }
1050 }
1051
1052 void net_process_received_packet(uchar *in_packet, int len)
1053 {
1054         struct ethernet_hdr *et;
1055         struct ip_udp_hdr *ip;
1056         struct in_addr dst_ip;
1057         struct in_addr src_ip;
1058         int eth_proto;
1059 #if defined(CONFIG_CMD_CDP)
1060         int iscdp;
1061 #endif
1062         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1063
1064         debug_cond(DEBUG_NET_PKT, "packet received\n");
1065
1066         net_rx_packet = in_packet;
1067         net_rx_packet_len = len;
1068         et = (struct ethernet_hdr *)in_packet;
1069
1070         /* too small packet? */
1071         if (len < ETHER_HDR_SIZE)
1072                 return;
1073
1074 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1075         if (push_packet) {
1076                 (*push_packet)(in_packet, len);
1077                 return;
1078         }
1079 #endif
1080
1081 #if defined(CONFIG_CMD_CDP)
1082         /* keep track if packet is CDP */
1083         iscdp = is_cdp_packet(et->et_dest);
1084 #endif
1085
1086         myvlanid = ntohs(net_our_vlan);
1087         if (myvlanid == (ushort)-1)
1088                 myvlanid = VLAN_NONE;
1089         mynvlanid = ntohs(net_native_vlan);
1090         if (mynvlanid == (ushort)-1)
1091                 mynvlanid = VLAN_NONE;
1092
1093         eth_proto = ntohs(et->et_protlen);
1094
1095         if (eth_proto < 1514) {
1096                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1097                 /*
1098                  *      Got a 802.2 packet.  Check the other protocol field.
1099                  *      XXX VLAN over 802.2+SNAP not implemented!
1100                  */
1101                 eth_proto = ntohs(et802->et_prot);
1102
1103                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1104                 len -= E802_HDR_SIZE;
1105
1106         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1107                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1108                 len -= ETHER_HDR_SIZE;
1109
1110         } else {                        /* VLAN packet */
1111                 struct vlan_ethernet_hdr *vet =
1112                         (struct vlan_ethernet_hdr *)et;
1113
1114                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1115
1116                 /* too small packet? */
1117                 if (len < VLAN_ETHER_HDR_SIZE)
1118                         return;
1119
1120                 /* if no VLAN active */
1121                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1122 #if defined(CONFIG_CMD_CDP)
1123                                 && iscdp == 0
1124 #endif
1125                                 )
1126                         return;
1127
1128                 cti = ntohs(vet->vet_tag);
1129                 vlanid = cti & VLAN_IDMASK;
1130                 eth_proto = ntohs(vet->vet_type);
1131
1132                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1133                 len -= VLAN_ETHER_HDR_SIZE;
1134         }
1135
1136         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1137
1138 #if defined(CONFIG_CMD_CDP)
1139         if (iscdp) {
1140                 cdp_receive((uchar *)ip, len);
1141                 return;
1142         }
1143 #endif
1144
1145         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1146                 if (vlanid == VLAN_NONE)
1147                         vlanid = (mynvlanid & VLAN_IDMASK);
1148                 /* not matched? */
1149                 if (vlanid != (myvlanid & VLAN_IDMASK))
1150                         return;
1151         }
1152
1153         switch (eth_proto) {
1154         case PROT_ARP:
1155                 arp_receive(et, ip, len);
1156                 break;
1157
1158 #ifdef CONFIG_CMD_RARP
1159         case PROT_RARP:
1160                 rarp_receive(ip, len);
1161                 break;
1162 #endif
1163         case PROT_IP:
1164                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1165                 /* Before we start poking the header, make sure it is there */
1166                 if (len < IP_UDP_HDR_SIZE) {
1167                         debug("len bad %d < %lu\n", len,
1168                               (ulong)IP_UDP_HDR_SIZE);
1169                         return;
1170                 }
1171                 /* Check the packet length */
1172                 if (len < ntohs(ip->ip_len)) {
1173                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1174                         return;
1175                 }
1176                 len = ntohs(ip->ip_len);
1177                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1178                            len, ip->ip_hl_v & 0xff);
1179
1180                 /* Can't deal with anything except IPv4 */
1181                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1182                         return;
1183                 /* Can't deal with IP options (headers != 20 bytes) */
1184                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1185                         return;
1186                 /* Check the Checksum of the header */
1187                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1188                         debug("checksum bad\n");
1189                         return;
1190                 }
1191                 /* If it is not for us, ignore it */
1192                 dst_ip = net_read_ip(&ip->ip_dst);
1193                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1194                     dst_ip.s_addr != 0xFFFFFFFF) {
1195 #ifdef CONFIG_MCAST_TFTP
1196                         if (net_mcast_addr != dst_ip)
1197 #endif
1198                                 return;
1199                 }
1200                 /* Read source IP address for later use */
1201                 src_ip = net_read_ip(&ip->ip_src);
1202                 /*
1203                  * The function returns the unchanged packet if it's not
1204                  * a fragment, and either the complete packet or NULL if
1205                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1206                  */
1207                 ip = net_defragment(ip, &len);
1208                 if (!ip)
1209                         return;
1210                 /*
1211                  * watch for ICMP host redirects
1212                  *
1213                  * There is no real handler code (yet). We just watch
1214                  * for ICMP host redirect messages. In case anybody
1215                  * sees these messages: please contact me
1216                  * (wd@denx.de), or - even better - send me the
1217                  * necessary fixes :-)
1218                  *
1219                  * Note: in all cases where I have seen this so far
1220                  * it was a problem with the router configuration,
1221                  * for instance when a router was configured in the
1222                  * BOOTP reply, but the TFTP server was on the same
1223                  * subnet. So this is probably a warning that your
1224                  * configuration might be wrong. But I'm not really
1225                  * sure if there aren't any other situations.
1226                  *
1227                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1228                  * we send a tftp packet to a dead connection, or when
1229                  * there is no server at the other end.
1230                  */
1231                 if (ip->ip_p == IPPROTO_ICMP) {
1232                         receive_icmp(ip, len, src_ip, et);
1233                         return;
1234                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1235                         return;
1236                 }
1237
1238                 debug_cond(DEBUG_DEV_PKT,
1239                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1240                            &dst_ip, &src_ip, len);
1241
1242 #ifdef CONFIG_UDP_CHECKSUM
1243                 if (ip->udp_xsum != 0) {
1244                         ulong   xsum;
1245                         ushort *sumptr;
1246                         ushort  sumlen;
1247
1248                         xsum  = ip->ip_p;
1249                         xsum += (ntohs(ip->udp_len));
1250                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1251                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1252                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1253                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1254
1255                         sumlen = ntohs(ip->udp_len);
1256                         sumptr = (ushort *)&(ip->udp_src);
1257
1258                         while (sumlen > 1) {
1259                                 ushort sumdata;
1260
1261                                 sumdata = *sumptr++;
1262                                 xsum += ntohs(sumdata);
1263                                 sumlen -= 2;
1264                         }
1265                         if (sumlen > 0) {
1266                                 ushort sumdata;
1267
1268                                 sumdata = *(unsigned char *)sumptr;
1269                                 sumdata = (sumdata << 8) & 0xff00;
1270                                 xsum += sumdata;
1271                         }
1272                         while ((xsum >> 16) != 0) {
1273                                 xsum = (xsum & 0x0000ffff) +
1274                                        ((xsum >> 16) & 0x0000ffff);
1275                         }
1276                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1277                                 printf(" UDP wrong checksum %08lx %08x\n",
1278                                        xsum, ntohs(ip->udp_xsum));
1279                                 return;
1280                         }
1281                 }
1282 #endif
1283
1284 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1285                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1286                                 src_ip,
1287                                 ntohs(ip->udp_dst),
1288                                 ntohs(ip->udp_src),
1289                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1290 #endif
1291                 /*
1292                  * IP header OK.  Pass the packet to the current handler.
1293                  */
1294                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1295                                       ntohs(ip->udp_dst),
1296                                       src_ip,
1297                                       ntohs(ip->udp_src),
1298                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1299                 break;
1300 #ifdef CONFIG_CMD_WOL
1301         case PROT_WOL:
1302                 wol_receive(ip, len);
1303                 break;
1304 #endif
1305         }
1306 }
1307
1308 /**********************************************************************/
1309
1310 static int net_check_prereq(enum proto_t protocol)
1311 {
1312         switch (protocol) {
1313                 /* Fall through */
1314 #if defined(CONFIG_CMD_PING)
1315         case PING:
1316                 if (net_ping_ip.s_addr == 0) {
1317                         puts("*** ERROR: ping address not given\n");
1318                         return 1;
1319                 }
1320                 goto common;
1321 #endif
1322 #if defined(CONFIG_CMD_SNTP)
1323         case SNTP:
1324                 if (net_ntp_server.s_addr == 0) {
1325                         puts("*** ERROR: NTP server address not given\n");
1326                         return 1;
1327                 }
1328                 goto common;
1329 #endif
1330 #if defined(CONFIG_CMD_DNS)
1331         case DNS:
1332                 if (net_dns_server.s_addr == 0) {
1333                         puts("*** ERROR: DNS server address not given\n");
1334                         return 1;
1335                 }
1336                 goto common;
1337 #endif
1338 #if defined(CONFIG_CMD_NFS)
1339         case NFS:
1340 #endif
1341                 /* Fall through */
1342         case TFTPGET:
1343         case TFTPPUT:
1344                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1345                         puts("*** ERROR: `serverip' not set\n");
1346                         return 1;
1347                 }
1348 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1349         defined(CONFIG_CMD_DNS)
1350 common:
1351 #endif
1352                 /* Fall through */
1353
1354         case NETCONS:
1355         case FASTBOOT:
1356         case TFTPSRV:
1357                 if (net_ip.s_addr == 0) {
1358                         puts("*** ERROR: `ipaddr' not set\n");
1359                         return 1;
1360                 }
1361                 /* Fall through */
1362
1363 #ifdef CONFIG_CMD_RARP
1364         case RARP:
1365 #endif
1366         case BOOTP:
1367         case CDP:
1368         case DHCP:
1369         case LINKLOCAL:
1370                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1371                         int num = eth_get_dev_index();
1372
1373                         switch (num) {
1374                         case -1:
1375                                 puts("*** ERROR: No ethernet found.\n");
1376                                 return 1;
1377                         case 0:
1378                                 puts("*** ERROR: `ethaddr' not set\n");
1379                                 break;
1380                         default:
1381                                 printf("*** ERROR: `eth%daddr' not set\n",
1382                                        num);
1383                                 break;
1384                         }
1385
1386                         net_start_again();
1387                         return 2;
1388                 }
1389                 /* Fall through */
1390         default:
1391                 return 0;
1392         }
1393         return 0;               /* OK */
1394 }
1395 /**********************************************************************/
1396
1397 int
1398 net_eth_hdr_size(void)
1399 {
1400         ushort myvlanid;
1401
1402         myvlanid = ntohs(net_our_vlan);
1403         if (myvlanid == (ushort)-1)
1404                 myvlanid = VLAN_NONE;
1405
1406         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1407                 VLAN_ETHER_HDR_SIZE;
1408 }
1409
1410 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1411 {
1412         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1413         ushort myvlanid;
1414
1415         myvlanid = ntohs(net_our_vlan);
1416         if (myvlanid == (ushort)-1)
1417                 myvlanid = VLAN_NONE;
1418
1419         memcpy(et->et_dest, dest_ethaddr, 6);
1420         memcpy(et->et_src, net_ethaddr, 6);
1421         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1422                 et->et_protlen = htons(prot);
1423                 return ETHER_HDR_SIZE;
1424         } else {
1425                 struct vlan_ethernet_hdr *vet =
1426                         (struct vlan_ethernet_hdr *)xet;
1427
1428                 vet->vet_vlan_type = htons(PROT_VLAN);
1429                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1430                 vet->vet_type = htons(prot);
1431                 return VLAN_ETHER_HDR_SIZE;
1432         }
1433 }
1434
1435 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1436 {
1437         ushort protlen;
1438
1439         memcpy(et->et_dest, addr, 6);
1440         memcpy(et->et_src, net_ethaddr, 6);
1441         protlen = ntohs(et->et_protlen);
1442         if (protlen == PROT_VLAN) {
1443                 struct vlan_ethernet_hdr *vet =
1444                         (struct vlan_ethernet_hdr *)et;
1445                 vet->vet_type = htons(prot);
1446                 return VLAN_ETHER_HDR_SIZE;
1447         } else if (protlen > 1514) {
1448                 et->et_protlen = htons(prot);
1449                 return ETHER_HDR_SIZE;
1450         } else {
1451                 /* 802.2 + SNAP */
1452                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1453                 et802->et_prot = htons(prot);
1454                 return E802_HDR_SIZE;
1455         }
1456 }
1457
1458 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1459 {
1460         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1461
1462         /*
1463          *      Construct an IP header.
1464          */
1465         /* IP_HDR_SIZE / 4 (not including UDP) */
1466         ip->ip_hl_v  = 0x45;
1467         ip->ip_tos   = 0;
1468         ip->ip_len   = htons(IP_HDR_SIZE);
1469         ip->ip_id    = htons(net_ip_id++);
1470         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1471         ip->ip_ttl   = 255;
1472         ip->ip_sum   = 0;
1473         /* already in network byte order */
1474         net_copy_ip((void *)&ip->ip_src, &source);
1475         /* already in network byte order */
1476         net_copy_ip((void *)&ip->ip_dst, &dest);
1477 }
1478
1479 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1480                         int len)
1481 {
1482         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1483
1484         /*
1485          *      If the data is an odd number of bytes, zero the
1486          *      byte after the last byte so that the checksum
1487          *      will work.
1488          */
1489         if (len & 1)
1490                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1491
1492         net_set_ip_header(pkt, dest, net_ip);
1493         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1494         ip->ip_p     = IPPROTO_UDP;
1495         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1496
1497         ip->udp_src  = htons(sport);
1498         ip->udp_dst  = htons(dport);
1499         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1500         ip->udp_xsum = 0;
1501 }
1502
1503 void copy_filename(char *dst, const char *src, int size)
1504 {
1505         if (src && *src && (*src == '"')) {
1506                 ++src;
1507                 --size;
1508         }
1509
1510         while ((--size > 0) && src && *src && (*src != '"'))
1511                 *dst++ = *src++;
1512         *dst = '\0';
1513 }
1514
1515 int is_serverip_in_cmd(void)
1516 {
1517         return !!strchr(net_boot_file_name, ':');
1518 }
1519
1520 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1521 {
1522         char *colon;
1523
1524         if (net_boot_file_name[0] == '\0')
1525                 return 0;
1526
1527         colon = strchr(net_boot_file_name, ':');
1528         if (colon) {
1529                 if (ipaddr)
1530                         *ipaddr = string_to_ip(net_boot_file_name);
1531                 strncpy(filename, colon + 1, max_len);
1532         } else {
1533                 strncpy(filename, net_boot_file_name, max_len);
1534         }
1535         filename[max_len - 1] = '\0';
1536
1537         return 1;
1538 }
1539
1540 #if     defined(CONFIG_CMD_NFS)         || \
1541         defined(CONFIG_CMD_SNTP)        || \
1542         defined(CONFIG_CMD_DNS)
1543 /*
1544  * make port a little random (1024-17407)
1545  * This keeps the math somewhat trivial to compute, and seems to work with
1546  * all supported protocols/clients/servers
1547  */
1548 unsigned int random_port(void)
1549 {
1550         return 1024 + (get_timer(0) % 0x4000);
1551 }
1552 #endif
1553
1554 void ip_to_string(struct in_addr x, char *s)
1555 {
1556         x.s_addr = ntohl(x.s_addr);
1557         sprintf(s, "%d.%d.%d.%d",
1558                 (int) ((x.s_addr >> 24) & 0xff),
1559                 (int) ((x.s_addr >> 16) & 0xff),
1560                 (int) ((x.s_addr >> 8) & 0xff),
1561                 (int) ((x.s_addr >> 0) & 0xff)
1562         );
1563 }
1564
1565 void vlan_to_string(ushort x, char *s)
1566 {
1567         x = ntohs(x);
1568
1569         if (x == (ushort)-1)
1570                 x = VLAN_NONE;
1571
1572         if (x == VLAN_NONE)
1573                 strcpy(s, "none");
1574         else
1575                 sprintf(s, "%d", x & VLAN_IDMASK);
1576 }
1577
1578 ushort string_to_vlan(const char *s)
1579 {
1580         ushort id;
1581
1582         if (s == NULL)
1583                 return htons(VLAN_NONE);
1584
1585         if (*s < '0' || *s > '9')
1586                 id = VLAN_NONE;
1587         else
1588                 id = (ushort)simple_strtoul(s, NULL, 10);
1589
1590         return htons(id);
1591 }
1592
1593 ushort env_get_vlan(char *var)
1594 {
1595         return string_to_vlan(env_get(var));
1596 }