fc.c 3.2 KB

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  1. /*
  2. * NET3: Fibre Channel device handling subroutines
  3. *
  4. * This program is free software; you can redistribute it and/or
  5. * modify it under the terms of the GNU General Public License
  6. * as published by the Free Software Foundation; either version
  7. * 2 of the License, or (at your option) any later version.
  8. *
  9. * Vineet Abraham <vma@iol.unh.edu>
  10. * v 1.0 03/22/99
  11. */
  12. #include <asm/uaccess.h>
  13. #include <asm/system.h>
  14. #include <linux/types.h>
  15. #include <linux/kernel.h>
  16. #include <linux/string.h>
  17. #include <linux/mm.h>
  18. #include <linux/socket.h>
  19. #include <linux/in.h>
  20. #include <linux/inet.h>
  21. #include <linux/netdevice.h>
  22. #include <linux/fcdevice.h>
  23. #include <linux/skbuff.h>
  24. #include <linux/errno.h>
  25. #include <linux/timer.h>
  26. #include <linux/net.h>
  27. #include <linux/proc_fs.h>
  28. #include <linux/init.h>
  29. #include <net/arp.h>
  30. /*
  31. * Put the headers on a Fibre Channel packet.
  32. */
  33. static int fc_header(struct sk_buff *skb, struct net_device *dev,
  34. unsigned short type,
  35. void *daddr, void *saddr, unsigned len)
  36. {
  37. struct fch_hdr *fch;
  38. int hdr_len;
  39. /*
  40. * Add the 802.2 SNAP header if IP as the IPv4 code calls
  41. * dev->hard_header directly.
  42. */
  43. if (type == ETH_P_IP || type == ETH_P_ARP)
  44. {
  45. struct fcllc *fcllc;
  46. hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
  47. fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  48. fcllc = (struct fcllc *)(fch+1);
  49. fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
  50. fcllc->llc = UI_CMD;
  51. fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
  52. fcllc->ethertype = htons(type);
  53. }
  54. else
  55. {
  56. hdr_len = sizeof(struct fch_hdr);
  57. fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  58. }
  59. if(saddr)
  60. memcpy(fch->saddr,saddr,dev->addr_len);
  61. else
  62. memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
  63. if(daddr)
  64. {
  65. memcpy(fch->daddr,daddr,dev->addr_len);
  66. return(hdr_len);
  67. }
  68. return -hdr_len;
  69. }
  70. /*
  71. * A neighbour discovery of some species (eg arp) has completed. We
  72. * can now send the packet.
  73. */
  74. static int fc_rebuild_header(struct sk_buff *skb)
  75. {
  76. struct fch_hdr *fch=(struct fch_hdr *)skb->data;
  77. struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
  78. if(fcllc->ethertype != htons(ETH_P_IP)) {
  79. printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
  80. return 0;
  81. }
  82. #ifdef CONFIG_INET
  83. return arp_find(fch->daddr, skb);
  84. #else
  85. return 0;
  86. #endif
  87. }
  88. static void fc_setup(struct net_device *dev)
  89. {
  90. dev->hard_header = fc_header;
  91. dev->rebuild_header = fc_rebuild_header;
  92. dev->type = ARPHRD_IEEE802;
  93. dev->hard_header_len = FC_HLEN;
  94. dev->mtu = 2024;
  95. dev->addr_len = FC_ALEN;
  96. dev->tx_queue_len = 100; /* Long queues on fc */
  97. dev->flags = IFF_BROADCAST;
  98. memset(dev->broadcast, 0xFF, FC_ALEN);
  99. }
  100. /**
  101. * alloc_fcdev - Register fibre channel device
  102. * @sizeof_priv: Size of additional driver-private structure to be allocated
  103. * for this fibre channel device
  104. *
  105. * Fill in the fields of the device structure with fibre channel-generic values.
  106. *
  107. * Constructs a new net device, complete with a private data area of
  108. * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
  109. * this private data area.
  110. */
  111. struct net_device *alloc_fcdev(int sizeof_priv)
  112. {
  113. return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
  114. }
  115. EXPORT_SYMBOL(alloc_fcdev);