rarp.c 2.8 KB

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  1. /*
  2. * (C) Copyright 2000-2002
  3. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. *
  5. * See file CREDITS for list of people who contributed to this
  6. * project.
  7. *
  8. * This program is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of
  11. * the License, or (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. * MA 02111-1307 USA
  22. */
  23. #include <common.h>
  24. #include <command.h>
  25. #include <net.h>
  26. #include "nfs.h"
  27. #include "bootp.h"
  28. #include "rarp.h"
  29. #include "tftp.h"
  30. #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
  31. #ifndef CONFIG_NET_RETRY_COUNT
  32. # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
  33. #else
  34. # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
  35. #endif
  36. int RarpTry;
  37. /*
  38. * Handle a RARP received packet.
  39. */
  40. static void
  41. RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3)
  42. {
  43. char *s;
  44. debug("Got good RARP\n");
  45. if ((s = getenv("autoload")) != NULL) {
  46. if (*s == 'n') {
  47. /*
  48. * Just use RARP to configure system;
  49. * Do not use TFTP/NFS to to load the bootfile.
  50. */
  51. NetState = NETLOOP_SUCCESS;
  52. return;
  53. #if defined(CONFIG_CMD_NFS)
  54. } else if ((s != NULL) && !strcmp(s, "NFS")) {
  55. NfsStart();
  56. return;
  57. #endif
  58. }
  59. }
  60. TftpStart ();
  61. }
  62. /*
  63. * Timeout on BOOTP request.
  64. */
  65. static void
  66. RarpTimeout(void)
  67. {
  68. if (RarpTry >= TIMEOUT_COUNT) {
  69. puts ("\nRetry count exceeded; starting again\n");
  70. NetStartAgain ();
  71. } else {
  72. NetSetTimeout (TIMEOUT, RarpTimeout);
  73. RarpRequest ();
  74. }
  75. }
  76. void
  77. RarpRequest (void)
  78. {
  79. int i;
  80. volatile uchar *pkt;
  81. ARP_t * rarp;
  82. printf("RARP broadcast %d\n", ++RarpTry);
  83. pkt = NetTxPacket;
  84. pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);
  85. rarp = (ARP_t *)pkt;
  86. rarp->ar_hrd = htons (ARP_ETHER);
  87. rarp->ar_pro = htons (PROT_IP);
  88. rarp->ar_hln = 6;
  89. rarp->ar_pln = 4;
  90. rarp->ar_op = htons (RARPOP_REQUEST);
  91. memcpy (&rarp->ar_data[0], NetOurEther, 6); /* source ET addr */
  92. memcpy (&rarp->ar_data[6], &NetOurIP, 4); /* source IP addr */
  93. memcpy (&rarp->ar_data[10], NetOurEther, 6); /* dest ET addr = source ET addr ??*/
  94. /* dest. IP addr set to broadcast */
  95. for (i = 0; i <= 3; i++) {
  96. rarp->ar_data[16 + i] = 0xff;
  97. }
  98. NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
  99. NetSetTimeout(TIMEOUT, RarpTimeout);
  100. NetSetHandler(RarpHandler);
  101. }