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