LXR linux/net/802/fc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * NET3:        Fibre Channel device handling subroutines
   4 *
   5 *              Vineet Abraham <vma@iol.unh.edu>
   6 *              v 1.0 03/22/99
   7 */
   8
   9#include <linux/uaccess.h>
  10#include <linux/types.h>
  11#include <linux/kernel.h>
  12#include <linux/string.h>
  13#include <linux/mm.h>
  14#include <linux/socket.h>
  15#include <linux/in.h>
  16#include <linux/inet.h>
  17#include <linux/netdevice.h>
  18#include <linux/fcdevice.h>
  19#include <linux/skbuff.h>
  20#include <linux/errno.h>
  21#include <linux/timer.h>
  22#include <linux/net.h>
  23#include <linux/proc_fs.h>
  24#include <linux/init.h>
  25#include <linux/export.h>
  26#include <net/arp.h>
  27
  28/*
  29 *      Put the headers on a Fibre Channel packet.
  30 */
  31
  32static int fc_header(struct sk_buff *skb, struct net_device *dev,
  33                     unsigned short type,
  34                     const void *daddr, const void *saddr, unsigned int len)
  35{
  36        struct fch_hdr *fch;
  37        int hdr_len;
  38
  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
  47                hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
  48                fch = skb_push(skb, hdr_len);
  49                fcllc = (struct fcllc *)(fch+1);
  50                fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
  51                fcllc->llc = UI_CMD;
  52                fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
  53                fcllc->ethertype = htons(type);
  54        }
  55        else
  56        {
  57                hdr_len = sizeof(struct fch_hdr);
  58                fch = skb_push(skb, hdr_len);
  59        }
  60
  61        if(saddr)
  62                memcpy(fch->saddr,saddr,dev->addr_len);
  63        else
  64                memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
  65
  66        if(daddr)
  67        {
  68                memcpy(fch->daddr,daddr,dev->addr_len);
  69                return hdr_len;
  70        }
  71        return -hdr_len;
  72}
  73
  74static const struct header_ops fc_header_ops = {
  75        .create  = fc_header,
  76};
  77
  78static void fc_setup(struct net_device *dev)
  79{
  80        dev->header_ops         = &fc_header_ops;
  81        dev->type               = ARPHRD_IEEE802;
  82        dev->hard_header_len    = FC_HLEN;
  83        dev->mtu                = 2024;
  84        dev->addr_len           = FC_ALEN;
  85        dev->tx_queue_len       = 100; /* Long queues on fc */
  86        dev->flags              = IFF_BROADCAST;
  87
  88        memset(dev->broadcast, 0xFF, FC_ALEN);
  89}
  90
  91/**
  92 * alloc_fcdev - Register fibre channel device
  93 * @sizeof_priv: Size of additional driver-private structure to be allocated
  94 *      for this fibre channel device
  95 *
  96 * Fill in the fields of the device structure with fibre channel-generic values.
  97 *
  98 * Constructs a new net device, complete with a private data area of
  99 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
 100 * this private data area.
 101 */
 102struct net_device *alloc_fcdev(int sizeof_priv)
 103{
 104        return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
 105}
 106EXPORT_SYMBOL(alloc_fcdev);
 107