linux/net/802/fc.c
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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
  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
  36static 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
  83static 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
  98static const struct header_ops fc_header_ops = {
  99        .create  = fc_header,
 100        .rebuild = fc_rebuild_header,
 101};
 102
 103static 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 */
 127struct net_device *alloc_fcdev(int sizeof_priv)
 128{
 129        return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
 130}
 131EXPORT_SYMBOL(alloc_fcdev);
 132
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