1 files changed, 210 insertions, 0 deletions

diff --git a/net/802/fddi.c b/net/802/fddi.c
new file mode 100644
index 000000000000..f9a31a9f70f1
--- /dev/null
+++ b/net/802/fddi.c
@@ -0,0 +1,210 @@
+/*
+ * 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.
+ *
+ *      Changes
+ *              Alan Cox                :       New arp/rebuild header
+ *              Maciej W. Rozycki       :       IPv6 support
+ */
+ 
+#include <linux/config.h>
+#include <linux/module.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/if_ether.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)
+ */
+
+static int fddi_header(struct sk_buff *skb, struct net_device *dev,
+                       unsigned short type,
+                       void *daddr, void *saddr, unsigned len)
+{
+        int hl = FDDI_K_SNAP_HLEN;
+        struct fddihdr *fddi;
+        
+        if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
+                hl=FDDI_K_8022_HLEN-3;
+        fddi = (struct fddihdr *)skb_push(skb, hl);
+        fddi->fc                         = FDDI_FC_K_ASYNC_LLC_DEF;
+        if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
+        {
+                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(hl);
+        }
+
+        return(-hl);
+}
+
+
+/*
+ * 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.
+ */
+ 
+static int fddi_rebuild_header(struct sk_buff   *skb)
+{
+        struct fddihdr *fddi = (struct fddihdr *)skb->data;
+
+#ifdef CONFIG_INET
+        if (fddi->hdr.llc_snap.ethertype == __constant_htons(ETH_P_IP))
+                /* Try to get ARP to resolve the header and fill destination address */
+                return arp_find(fddi->daddr, skb);
+        else
+#endif  
+        {
+                printk("%s: Don't know how to resolve type %02X addresses.\n",
+                       skb->dev->name, htons(fddi->hdr.llc_snap.ethertype));
+                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 net_device *dev)
+{
+        struct fddihdr *fddi = (struct fddihdr *)skb->data;
+        unsigned short type;
+        
+        /*
+         * 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) */
+        
+        if(fddi->hdr.llc_8022_1.dsap==0xe0)
+        {
+                skb_pull(skb, FDDI_K_8022_HLEN-3);
+                type = __constant_htons(ETH_P_802_2);
+        }
+        else
+        {
+                skb_pull(skb, FDDI_K_SNAP_HLEN);                /* adjust for 21 byte header */
+                type=fddi->hdr.llc_snap.ethertype;
+        }
+        
+        /* 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(type);
+}
+
+EXPORT_SYMBOL(fddi_type_trans);
+
+static int fddi_change_mtu(struct net_device *dev, int new_mtu)
+{
+        if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
+                return(-EINVAL);
+        dev->mtu = new_mtu;
+        return(0);
+}
+
+static void fddi_setup(struct net_device *dev)
+{
+        dev->change_mtu         = fddi_change_mtu;
+        dev->hard_header        = fddi_header;
+        dev->rebuild_header     = fddi_rebuild_header;
+
+        dev->type               = ARPHRD_FDDI;
+        dev->hard_header_len    = FDDI_K_SNAP_HLEN+3;   /* Assume 802.2 SNAP hdr len + 3 pad bytes */
+        dev->mtu                = FDDI_K_SNAP_DLEN;     /* Assume max payload of 802.2 SNAP frame */
+        dev->addr_len           = FDDI_K_ALEN;
+        dev->tx_queue_len       = 100;                  /* Long queues on FDDI */
+        dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
+        
+        memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
+}
+
+/**
+ * alloc_fddidev - Register FDDI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *      for this FDDI device
+ *
+ * Fill in the fields of the device structure with FDDI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_fddidev(int sizeof_priv)
+{
+        return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup);
+}
+EXPORT_SYMBOL(alloc_fddidev);