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/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* HIPPI-type device handling.
*
* Version: @(#)hippi.c 1.0.0 05/29/97
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Mark Evans, <evansmp@uhura.aston.ac.uk>
* Florian La Roche, <rzsfl@rz.uni-sb.de>
* Alan Cox, <gw4pts@gw4pts.ampr.org>
* Jes Sorensen, <Jes.Sorensen@cern.ch>
*
* 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.
*/
#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/hippidevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <net/arp.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
#include <asm/segment.h>
#include <asm/system.h>
/*
* hippi_net_init()
*
* Do nothing, this is just to pursuade the stupid linker to behave.
*/
void hippi_net_init(void)
{
return;
}
/*
* Create the HIPPI MAC header for an arbitrary protocol layer
*
* saddr=NULL means use device source address
* daddr=NULL means leave destination address (eg unresolved arp)
*/
int hippi_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, void *daddr, void *saddr,
unsigned len)
{
struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
if (!len){
len = skb->len - HIPPI_HLEN;
printk("hippi_header(): length not supplied\n");
}
/*
* Due to the stupidity of the little endian byte-order we
* have to set the fp field this way.
*/
hip->fp.fixed = __constant_htonl(0x04800018);
hip->fp.d2_size = htonl(len + 8);
hip->le.fc = 0;
hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
hip->le.message_type = 0; /* Data PDU */
hip->le.dest_addr_type = 2; /* 12 bit SC address */
hip->le.src_addr_type = 2; /* 12 bit SC address */
memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
memset(&hip->le.reserved, 0, 16);
hip->snap.dsap = HIPPI_EXTENDED_SAP;
hip->snap.ssap = HIPPI_EXTENDED_SAP;
hip->snap.ctrl = HIPPI_UI_CMD;
hip->snap.oui[0] = 0x00;
hip->snap.oui[1] = 0x00;
hip->snap.oui[2] = 0x00;
hip->snap.ethertype = htons(type);
if (daddr)
{
memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
memcpy(&skb->private.ifield, daddr + 2, 4);
return HIPPI_HLEN;
}
return -((int)HIPPI_HLEN);
}
/*
* Rebuild the HIPPI MAC header. This is called after an ARP has
* completed on this sk_buff. We now let ARP fill in the other fields.
*/
int hippi_rebuild_header(struct sk_buff *skb)
{
struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
/*
* Only IP is currently supported
*/
if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
{
printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
return 0;
}
/*
* We don't support dynamic ARP on HIPPI, but we use the ARP
* static ARP tables to hold the I-FIELDs.
*/
return arp_find(hip->le.daddr, skb);
}
/*
* Determine the packet's protocol ID.
*/
unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct hippi_hdr *hip;
hip = (struct hippi_hdr *) skb->data;
/*
* This is actually wrong ... question is if we really should
* set the raw address here.
*/
skb->mac.raw = skb->data;
skb_pull(skb, HIPPI_HLEN);
/*
* No fancy promisc stuff here now.
*/
return hip->snap.ethertype;
}
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