patch-2.0.24 linux/net/802/fddi.c

• Lines: 163
• Date: Wed Oct 30 04:36:35 1996
• Orig file: v2.0.23/linux/net/802/fddi.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.0.23/linux/net/802/fddi.c linux/net/802/fddi.c
@@ -0,0 +1,162 @@
+/*
+ * 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.
+ *
+ *		FDDI-type device handling.
+ *
+ * Version:	@(#)fddi.c	1.0.0	08/12/96
+ *
+ * Authors:	Lawrence V. Stefani, <stefani@lkg.dec.com>
+ *
+ *		fddi.c is based on previous eth.c and tr.c work by
+ *			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>
+ * 
+ *		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 <asm/segment.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/fddidevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <net/arp.h>
+#include <net/sock.h>
+
+/*
+ * Create the FDDI MAC header for an arbitrary protocol layer
+ *
+ * saddr=NULL	means use device source address
+ * daddr=NULL	means leave destination address (eg unresolved arp)
+ */
+
+int fddi_header(
+	struct sk_buff	*skb,
+	struct device	*dev,
+	unsigned short	type,
+	void			*daddr,
+	void			*saddr,
+	unsigned		len
+	)
+
+	{
+	struct fddihdr *fddi = (struct fddihdr *)skb_push(skb, FDDI_K_SNAP_HLEN);
+
+	/* Fill in frame header - assume 802.2 SNAP frames for now */
+
+	fddi->fc					 = FDDI_FC_K_ASYNC_LLC_DEF;
+	fddi->hdr.llc_snap.dsap		 = FDDI_EXTENDED_SAP;
+	fddi->hdr.llc_snap.ssap		 = FDDI_EXTENDED_SAP;
+	fddi->hdr.llc_snap.ctrl		 = FDDI_UI_CMD;
+	fddi->hdr.llc_snap.oui[0]	 = 0x00;
+	fddi->hdr.llc_snap.oui[1]	 = 0x00;
+	fddi->hdr.llc_snap.oui[2]	 = 0x00;
+	fddi->hdr.llc_snap.ethertype = htons(type);
+
+	/* Set the source and destination hardware addresses */
+	 
+	if (saddr != NULL)
+		memcpy(fddi->saddr, saddr, dev->addr_len);
+	else
+		memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
+
+	if (daddr != NULL)
+		{
+		memcpy(fddi->daddr, daddr, dev->addr_len);
+		return(FDDI_K_SNAP_HLEN);
+		}
+	return(-FDDI_K_SNAP_HLEN);
+	}
+
+
+/*
+ * Rebuild the FDDI MAC header. This is called after an ARP
+ * (or in future other address resolution) has completed on
+ * this sk_buff.  We now let ARP fill in the other fields.
+ */
+ 
+int fddi_rebuild_header(
+	void			*buff,
+	struct device	*dev,
+	unsigned long	dest,
+	struct sk_buff	*skb
+	)
+
+	{
+	struct fddihdr *fddi = (struct fddihdr *)buff;
+
+	/* Only ARP/IP is currently supported */
+	 
+	if (fddi->hdr.llc_snap.ethertype != htons(ETH_P_IP))
+		{
+		printk("fddi_rebuild_header: Don't know how to resolve type %04X addresses?\n", (unsigned int)htons(fddi->hdr.llc_snap.ethertype));
+		return(0);
+		}
+
+	/* Try to get ARP to resolve the header and fill destination address */
+
+	if (arp_find(fddi->daddr, dest, dev, dev->pa_addr, skb))
+		return(1);
+	else
+		return(0);
+	}
+
+
+/*
+ * Determine the packet's protocol ID and fill in skb fields.
+ * This routine is called before an incoming packet is passed
+ * up.  It's used to fill in specific skb fields and to set
+ * the proper pointer to the start of packet data (skb->data).
+ */
+ 
+unsigned short fddi_type_trans(
+	struct sk_buff	*skb,
+	struct device	*dev
+	)
+
+	{
+	struct fddihdr *fddi = (struct fddihdr *)skb->data;
+
+	/*
+	 * Set mac.raw field to point to FC byte, set data field to point
+	 * to start of packet data.  Assume 802.2 SNAP frames for now.
+	 */
+
+	skb->mac.raw = skb->data;			/* point to frame control (FC) */
+	skb_pull(skb, FDDI_K_SNAP_HLEN);	/* adjust for 21 byte header */
+
+	/* Set packet type based on destination address and flag settings */
+			
+	if (*fddi->daddr & 0x01)
+		{
+		if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
+			skb->pkt_type = PACKET_BROADCAST;
+		else
+			skb->pkt_type = PACKET_MULTICAST;
+		}
+	
+	else if (dev->flags & IFF_PROMISC)
+		{
+		if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
+			skb->pkt_type = PACKET_OTHERHOST;
+		}
+
+	/* Assume 802.2 SNAP frames, for now */
+
+	return(fddi->hdr.llc_snap.ethertype);
+	}