Root/net/802/fc.c

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
78/*
79 * A neighbour discovery of some species (eg arp) has completed. We
80 * can now send the packet.
81 */
82
83static 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
98static const struct header_ops fc_header_ops = {
99    .create = fc_header,
100    .rebuild = fc_rebuild_header,
101};
102
103static 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
116/**
117 * alloc_fcdev - Register fibre channel device
118 * @sizeof_priv: Size of additional driver-private structure to be allocated
119 * for this fibre channel device
120 *
121 * Fill in the fields of the device structure with fibre channel-generic values.
122 *
123 * Constructs a new net device, complete with a private data area of
124 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
125 * this private data area.
126 */
127struct net_device *alloc_fcdev(int sizeof_priv)
128{
129    return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
130}
131EXPORT_SYMBOL(alloc_fcdev);
132

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