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/*
* NET3: Fibre Channel device handling subroutines
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Vineet Abraham <vma@iol.unh.edu>
* v 1.0 03/22/99
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/fcdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/net.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <net/arp.h>
/*
* Put the headers on a Fibre Channel packet.
*/
int fc_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
void *daddr, void *saddr, unsigned len)
{
struct fch_hdr *fch;
int hdr_len;
/*
* Add the 802.2 SNAP header if IP as the IPv4 code calls
* dev->hard_header directly.
*/
if (type == ETH_P_IP || type == ETH_P_ARP)
{
struct fcllc *fcllc;
hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
fch = (struct fch_hdr *)skb_push(skb, hdr_len);
fcllc = (struct fcllc *)(fch+1);
fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
fcllc->llc = UI_CMD;
fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
fcllc->ethertype = htons(type);
}
else
{
hdr_len = sizeof(struct fch_hdr);
fch = (struct fch_hdr *)skb_push(skb, hdr_len);
}
if(saddr)
memcpy(fch->saddr,saddr,dev->addr_len);
else
memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
if(daddr)
{
memcpy(fch->daddr,daddr,dev->addr_len);
return(hdr_len);
}
return -hdr_len;
}
/*
* A neighbour discovery of some species (eg arp) has completed. We
* can now send the packet.
*/
int fc_rebuild_header(struct sk_buff *skb)
{
struct fch_hdr *fch=(struct fch_hdr *)skb->data;
struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));
if(fcllc->ethertype != htons(ETH_P_IP)) {
printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n",(unsigned int)htons(fcllc->ethertype));
return 0;
}
#ifdef CONFIG_INET
return arp_find(fch->daddr, skb);
#else
return 0;
#endif
}
unsigned short
fc_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct fch_hdr *fch = (struct fch_hdr *)skb->data;
struct fcllc *fcllc;
skb->mac.raw = skb->data;
fcllc = (struct fcllc *)(skb->data + sizeof (struct fch_hdr) + 2);
skb_pull(skb, sizeof (struct fch_hdr) + 2);
if (*fch->daddr & 1) {
if (!memcmp(fch->daddr, dev->broadcast, FC_ALEN))
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
} else if (dev->flags & IFF_PROMISC) {
if (memcmp(fch->daddr, dev->dev_addr, FC_ALEN))
skb->pkt_type = PACKET_OTHERHOST;
}
/*
* Strip the SNAP header from ARP packets since we don't pass
* them through to the 802.2/SNAP layers.
*/
if (fcllc->dsap == EXTENDED_SAP &&
(fcllc->ethertype == ntohs(ETH_P_IP) ||
fcllc->ethertype == ntohs(ETH_P_ARP))) {
skb_pull(skb, sizeof (struct fcllc));
return fcllc->ethertype;
}
return ntohs(ETH_P_802_2);
}
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