Linux Kernel  3.7.1
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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 <[email protected]>
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 
127 struct net_device *alloc_fcdev(int sizeof_priv)
128 {
129  return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
130 }