blob: 282c4ab1abe60836c79cccb39173cf2cbc918f92 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
14#include <asm/uaccess.h>
15#include <asm/system.h>
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/sched.h>
19#include <linux/string.h>
20#include <linux/mm.h>
21#include <linux/socket.h>
22#include <linux/in.h>
23#include <linux/inet.h>
24#include <linux/netdevice.h>
25#include <linux/fcdevice.h>
26#include <linux/skbuff.h>
27#include <linux/errno.h>
28#include <linux/timer.h>
29#include <linux/net.h>
30#include <linux/proc_fs.h>
31#include <linux/init.h>
32#include <net/arp.h>
33
34/*
35 * Put the headers on a Fibre Channel packet.
36 */
37
38static int fc_header(struct sk_buff *skb, struct net_device *dev,
39 unsigned short type,
40 void *daddr, void *saddr, unsigned len)
41{
42 struct fch_hdr *fch;
43 int hdr_len;
44
45 /*
46 * Add the 802.2 SNAP header if IP as the IPv4 code calls
47 * dev->hard_header directly.
48 */
49 if (type == ETH_P_IP || type == ETH_P_ARP)
50 {
51 struct fcllc *fcllc;
52
53 hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
54 fch = (struct fch_hdr *)skb_push(skb, hdr_len);
55 fcllc = (struct fcllc *)(fch+1);
56 fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
57 fcllc->llc = UI_CMD;
58 fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
59 fcllc->ethertype = htons(type);
60 }
61 else
62 {
63 hdr_len = sizeof(struct fch_hdr);
64 fch = (struct fch_hdr *)skb_push(skb, hdr_len);
65 }
66
67 if(saddr)
68 memcpy(fch->saddr,saddr,dev->addr_len);
69 else
70 memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
71
72 if(daddr)
73 {
74 memcpy(fch->daddr,daddr,dev->addr_len);
75 return(hdr_len);
76 }
77 return -hdr_len;
78}
79
80/*
81 * A neighbour discovery of some species (eg arp) has completed. We
82 * can now send the packet.
83 */
84
85static int fc_rebuild_header(struct sk_buff *skb)
86{
87 struct fch_hdr *fch=(struct fch_hdr *)skb->data;
88 struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
89 if(fcllc->ethertype != htons(ETH_P_IP)) {
Alexey Dobriyan57bf1452005-08-25 16:06:19 -070090 printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return 0;
92 }
93#ifdef CONFIG_INET
94 return arp_find(fch->daddr, skb);
95#else
96 return 0;
97#endif
98}
99
100static void fc_setup(struct net_device *dev)
101{
102 dev->hard_header = fc_header;
103 dev->rebuild_header = fc_rebuild_header;
104
105 dev->type = ARPHRD_IEEE802;
106 dev->hard_header_len = FC_HLEN;
107 dev->mtu = 2024;
108 dev->addr_len = FC_ALEN;
109 dev->tx_queue_len = 100; /* Long queues on fc */
110 dev->flags = IFF_BROADCAST;
111
112 memset(dev->broadcast, 0xFF, FC_ALEN);
113}
114
115/**
116 * alloc_fcdev - Register fibre channel device
117 * @sizeof_priv: Size of additional driver-private structure to be allocated
118 * for this fibre channel device
119 *
120 * Fill in the fields of the device structure with fibre channel-generic values.
121 *
122 * Constructs a new net device, complete with a private data area of
123 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
124 * this private data area.
125 */
126struct net_device *alloc_fcdev(int sizeof_priv)
127{
128 return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
129}
130EXPORT_SYMBOL(alloc_fcdev);