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/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
38int fc_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
39              void *daddr, void *saddr, unsigned len)
40{
41	struct fch_hdr *fch;
42	int hdr_len;
43
44	/*
45	 * Add the 802.2 SNAP header if IP as the IPv4 code calls
46	 * dev->hard_header directly.
47	 */
48	if (type == ETH_P_IP || type == ETH_P_ARP)
49	{
50		struct fcllc *fcllc=(struct fcllc *)(fch+1);
51
52		hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
53		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
54		fcllc = (struct fcllc *)(fch+1);
55		fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
56		fcllc->llc = UI_CMD;
57		fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
58		fcllc->ethertype = htons(type);
59	}
60	else
61	{
62		hdr_len = sizeof(struct fch_hdr);
63		fch = (struct fch_hdr *)skb_push(skb, hdr_len);
64	}
65
66	if(saddr)
67		memcpy(fch->saddr,saddr,dev->addr_len);
68	else
69		memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
70
71	if(daddr)
72	{
73		memcpy(fch->daddr,daddr,dev->addr_len);
74		return(hdr_len);
75	}
76	return -hdr_len;
77}
78
79/*
80 *	A neighbour discovery of some species (eg arp) has completed. We
81 *	can now send the packet.
82 */
83
84int fc_rebuild_header(struct sk_buff *skb)
85{
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",(unsigned int)htons(fcllc->ethertype));
90		return 0;
91	}
92#ifdef CONFIG_INET
93	return arp_find(fch->daddr, skb);
94#else
95	return 0;
96#endif
97}
98
99