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
78static const struct header_ops fc_header_ops = {
79	.create	 = fc_header,
80};
81
82static 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 */
106struct net_device *alloc_fcdev(int sizeof_priv)
107{
108	return alloc_netdev(sizeof_priv, "fc%d", NET_NAME_UNKNOWN, fc_setup);
109}
110EXPORT_SYMBOL(alloc_fcdev);
111