net/802/fc.c

   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
  13 #include <asm/uaccess.h>
  14 #include <asm/system.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/socket.h>
  20 #include <linux/in.h>
  21 #include <linux/inet.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/fcdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/errno.h>
  26 #include <linux/timer.h>
  27 #include <linux/net.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/init.h>
  30 #include <linux/export.h>
  31 #include <net/arp.h>
  32
  33 /*
  34  *      Put the headers on a Fibre Channel packet.
  35  */
  36
  37 static int fc_header(struct sk_buff *skb, struct net_device *dev,
  38                      unsigned short type,
  39                      const void *daddr, const void *saddr, unsigned len)
  40 {
  41         struct fch_hdr *fch;
  42         int hdr_len;
  43
  44         /*
  45          * Add the 802.2 SNAP header if IP as the IPv4 code calls
  46          * dev->hard_header directly.
  47          */
  48         if (type == ETH_P_IP || type == ETH_P_ARP)
  49         {
  50                 struct fcllc *fcllc;
  51
  52                 hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
  53                 fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  54                 fcllc = (struct fcllc *)(fch+1);
  55                 fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
  56                 fcllc->llc = UI_CMD;
  57                 fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
  58                 fcllc->ethertype = htons(type);
  59         }
  60         else
  61         {
  62                 hdr_len = sizeof(struct fch_hdr);
  63                 fch = (struct fch_hdr *)skb_push(skb, hdr_len);
  64         }
  65
  66         if(saddr)
  67                 memcpy(fch->saddr,saddr,dev->addr_len);
  68         else
  69                 memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
  70
  71         if(daddr)
  72         {
  73                 memcpy(fch->daddr,daddr,dev->addr_len);
  74                 return hdr_len;
  75         }
  76         return -hdr_len;
  77 }
  78
  79 /*
  80  *      A neighbour discovery of some species (eg arp) has completed. We
  81  *      can now send the packet.
  82  */
  83
  84 static int fc_rebuild_header(struct sk_buff *skb)
  85 {
  86 #ifdef CONFIG_INET
  87         struct fch_hdr *fch=(struct fch_hdr *)skb->data;
  88         struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
  89         if(fcllc->ethertype != htons(ETH_P_IP)) {
  90                 printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
  91                 return 0;
  92         }
  93         return arp_find(fch->daddr, skb);
  94 #else
  95         return 0;
  96 #endif
  97 }
  98
  99 static const struct header_ops fc_header_ops = {
 100         .create  = fc_header,
 101         .rebuild = fc_rebuild_header,
 102 };
 103
 104 static void fc_setup(struct net_device *dev)
 105 {
 106         dev->header_ops         = &fc_header_ops;
 107         dev->type               = ARPHRD_IEEE802;
 108         dev->hard_header_len    = FC_HLEN;
 109         dev->mtu                = 2024;
 110         dev->addr_len           = FC_ALEN;
 111         dev->tx_queue_len       = 100; /* Long queues on fc */
 112         dev->flags              = IFF_BROADCAST;
 113
 114         memset(dev->broadcast, 0xFF, FC_ALEN);
 115 }
 116
 117 /**
 118  * alloc_fcdev - Register fibre channel device
 119  * @sizeof_priv: Size of additional driver-private structure to be allocated
 120  *      for this fibre channel device
 121  *
 122  * Fill in the fields of the device structure with fibre channel-generic values.
 123  *
 124  * Constructs a new net device, complete with a private data area of
 125  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
 126  * this private data area.
 127  */
 128 struct net_device *alloc_fcdev(int sizeof_priv)
 129 {
 130         return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
 131 }
 132 EXPORT_SYMBOL(alloc_fcdev);