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TOMOYO Linux Cross Reference
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 <linux/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 = 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 = 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 static const struct header_ops fc_header_ops = {
 79         .create  = fc_header,
 80 };
 81 
 82 static void fc_setup(struct net_device *dev)
 83 {
 84         dev->header_ops         = &fc_header_ops;
 85         dev->type               = ARPHRD_IEEE802;
 86         dev->hard_header_len    = FC_HLEN;
 87         dev->mtu                = 2024;
 88         dev->addr_len           = FC_ALEN;
 89         dev->tx_queue_len       = 100; /* Long queues on fc */
 90         dev->flags              = IFF_BROADCAST;
 91 
 92         memset(dev->broadcast, 0xFF, FC_ALEN);
 93 }
 94 
 95 /**
 96  * alloc_fcdev - Register fibre channel device
 97  * @sizeof_priv: Size of additional driver-private structure to be allocated
 98  *      for this fibre channel device
 99  *
100  * Fill in the fields of the device structure with fibre channel-generic values.
101  *
102  * Constructs a new net device, complete with a private data area of
103  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
104  * this private data area.
105  */
106 struct net_device *alloc_fcdev(int sizeof_priv)
107 {
108         return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
109 }
110 EXPORT_SYMBOL(alloc_fcdev);
111 

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