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1629 |
jcastillo |
/*
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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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* FDDI-type device handling.
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*
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* Version: @(#)fddi.c 1.0.0 08/12/96
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*
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* Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
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*
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* fddi.c is based on previous eth.c and tr.c work by
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* 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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*
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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 <asm/segment.h>
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#include <asm/system.h>
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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/fddidevice.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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/*
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* Create the FDDI 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 fddi_header(
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struct sk_buff *skb,
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struct device *dev,
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unsigned short type,
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void *daddr,
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void *saddr,
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unsigned len
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)
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{
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struct fddihdr *fddi = (struct fddihdr *)skb_push(skb, FDDI_K_SNAP_HLEN);
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/* Fill in frame header - assume 802.2 SNAP frames for now */
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fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
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fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
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fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
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fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
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fddi->hdr.llc_snap.oui[0] = 0x00;
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fddi->hdr.llc_snap.oui[1] = 0x00;
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fddi->hdr.llc_snap.oui[2] = 0x00;
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fddi->hdr.llc_snap.ethertype = htons(type);
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/* Set the source and destination hardware addresses */
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if (saddr != NULL)
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memcpy(fddi->saddr, saddr, dev->addr_len);
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else
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memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
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if (daddr != NULL)
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{
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memcpy(fddi->daddr, daddr, dev->addr_len);
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return(FDDI_K_SNAP_HLEN);
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}
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return(-FDDI_K_SNAP_HLEN);
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}
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/*
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* Rebuild the FDDI MAC header. This is called after an ARP
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* (or in future other address resolution) has completed on
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* this sk_buff. We now let ARP fill in the other fields.
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*/
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int fddi_rebuild_header(
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void *buff,
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struct device *dev,
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unsigned long dest,
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struct sk_buff *skb
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)
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{
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struct fddihdr *fddi = (struct fddihdr *)buff;
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/* Only ARP/IP is currently supported */
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if (fddi->hdr.llc_snap.ethertype != htons(ETH_P_IP))
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{
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printk("fddi_rebuild_header: Don't know how to resolve type %04X addresses?\n", (unsigned int)htons(fddi->hdr.llc_snap.ethertype));
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return(0);
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}
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/* Try to get ARP to resolve the header and fill destination address */
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if (arp_find(fddi->daddr, dest, dev, dev->pa_addr, skb))
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return(1);
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else
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return(0);
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}
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/*
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* Determine the packet's protocol ID and fill in skb fields.
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* This routine is called before an incoming packet is passed
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* up. It's used to fill in specific skb fields and to set
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* the proper pointer to the start of packet data (skb->data).
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*/
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unsigned short fddi_type_trans(
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struct sk_buff *skb,
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struct device *dev
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)
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{
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struct fddihdr *fddi = (struct fddihdr *)skb->data;
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/*
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* Set mac.raw field to point to FC byte, set data field to point
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* to start of packet data. Assume 802.2 SNAP frames for now.
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*/
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skb->mac.raw = skb->data; /* point to frame control (FC) */
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skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
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/* Set packet type based on destination address and flag settings */
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if (*fddi->daddr & 0x01)
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{
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if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
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skb->pkt_type = PACKET_BROADCAST;
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else
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skb->pkt_type = PACKET_MULTICAST;
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}
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else if (dev->flags & IFF_PROMISC)
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{
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if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
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skb->pkt_type = PACKET_OTHERHOST;
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}
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/* Assume 802.2 SNAP frames, for now */
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return(fddi->hdr.llc_snap.ethertype);
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}
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