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1275 |
phoenix |
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* HIPPI-type device handling.
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*
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* Version: @(#)hippi.c 1.0.0 05/29/97
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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* Florian La Roche, <rzsfl@rz.uni-sb.de>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Jes Sorensen, <Jes.Sorensen@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/hippidevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <net/arp.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/checksum.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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/*
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* hippi_net_init()
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*
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* Do nothing, this is just to pursuade the stupid linker to behave.
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*/
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void hippi_net_init(void)
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{
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return;
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}
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/*
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* Create the HIPPI MAC header for an arbitrary protocol layer
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*
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* saddr=NULL means use device source address
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* daddr=NULL means leave destination address (eg unresolved arp)
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*/
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int hippi_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, void *daddr, void *saddr,
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unsigned len)
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{
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struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
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if (!len){
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len = skb->len - HIPPI_HLEN;
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printk("hippi_header(): length not supplied\n");
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}
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/*
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* Due to the stupidity of the little endian byte-order we
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* have to set the fp field this way.
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*/
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hip->fp.fixed = __constant_htonl(0x04800018);
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hip->fp.d2_size = htonl(len + 8);
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hip->le.fc = 0;
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hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
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hip->le.message_type = 0; /* Data PDU */
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hip->le.dest_addr_type = 2; /* 12 bit SC address */
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hip->le.src_addr_type = 2; /* 12 bit SC address */
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memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
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memset(&hip->le.reserved, 0, 16);
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hip->snap.dsap = HIPPI_EXTENDED_SAP;
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hip->snap.ssap = HIPPI_EXTENDED_SAP;
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hip->snap.ctrl = HIPPI_UI_CMD;
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hip->snap.oui[0] = 0x00;
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hip->snap.oui[1] = 0x00;
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hip->snap.oui[2] = 0x00;
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hip->snap.ethertype = htons(type);
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if (daddr)
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{
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memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
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memcpy(&skb->private.ifield, daddr + 2, 4);
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return HIPPI_HLEN;
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}
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return -((int)HIPPI_HLEN);
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}
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/*
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* Rebuild the HIPPI MAC header. This is called after an ARP has
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* completed on this sk_buff. We now let ARP fill in the other fields.
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*/
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int hippi_rebuild_header(struct sk_buff *skb)
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{
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struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
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/*
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* Only IP is currently supported
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*/
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if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
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{
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printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
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return 0;
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}
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/*
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* We don't support dynamic ARP on HIPPI, but we use the ARP
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* static ARP tables to hold the I-FIELDs.
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*/
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return arp_find(hip->le.daddr, skb);
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}
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/*
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* Determine the packet's protocol ID.
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*/
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unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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struct hippi_hdr *hip;
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hip = (struct hippi_hdr *) skb->data;
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/*
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* This is actually wrong ... question is if we really should
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* set the raw address here.
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*/
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skb->mac.raw = skb->data;
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skb_pull(skb, HIPPI_HLEN);
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/*
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* No fancy promisc stuff here now.
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*/
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return hip->snap.ethertype;
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}
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