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Linux/net/802/fc.c

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  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 
 32 static 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 
 74 static const struct header_ops fc_header_ops = {
 75         .create  = fc_header,
 76 };
 77 
 78 static 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  */
102 struct net_device *alloc_fcdev(int sizeof_priv)
103 {
104         return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
105 }
106 EXPORT_SYMBOL(alloc_fcdev);
107 

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