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Linux/net/802/fddi.c

  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              FDDI-type device handling.
  7  *
  8  * Version:     @(#)fddi.c      1.0.0   08/12/96
  9  *
 10  * Authors:     Lawrence V. Stefani, <stefani@lkg.dec.com>
 11  *
 12  *              fddi.c is based on previous eth.c and tr.c work by
 13  *                      Ross Biro
 14  *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 15  *                      Mark Evans, <evansmp@uhura.aston.ac.uk>
 16  *                      Florian La Roche, <rzsfl@rz.uni-sb.de>
 17  *                      Alan Cox, <gw4pts@gw4pts.ampr.org>
 18  *
 19  *              This program is free software; you can redistribute it and/or
 20  *              modify it under the terms of the GNU General Public License
 21  *              as published by the Free Software Foundation; either version
 22  *              2 of the License, or (at your option) any later version.
 23  *
 24  *      Changes
 25  *              Alan Cox                :       New arp/rebuild header
 26  *              Maciej W. Rozycki       :       IPv6 support
 27  */
 28 
 29 #include <linux/module.h>
 30 #include <linux/types.h>
 31 #include <linux/kernel.h>
 32 #include <linux/string.h>
 33 #include <linux/mm.h>
 34 #include <linux/socket.h>
 35 #include <linux/in.h>
 36 #include <linux/inet.h>
 37 #include <linux/netdevice.h>
 38 #include <linux/fddidevice.h>
 39 #include <linux/if_ether.h>
 40 #include <linux/skbuff.h>
 41 #include <linux/errno.h>
 42 #include <net/arp.h>
 43 #include <net/sock.h>
 44 
 45 /*
 46  * Create the FDDI MAC header for an arbitrary protocol layer
 47  *
 48  * saddr=NULL   means use device source address
 49  * daddr=NULL   means leave destination address (eg unresolved arp)
 50  */
 51 
 52 static int fddi_header(struct sk_buff *skb, struct net_device *dev,
 53                        unsigned short type,
 54                        const void *daddr, const void *saddr, unsigned int len)
 55 {
 56         int hl = FDDI_K_SNAP_HLEN;
 57         struct fddihdr *fddi;
 58 
 59         if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
 60                 hl=FDDI_K_8022_HLEN-3;
 61         fddi = (struct fddihdr *)skb_push(skb, hl);
 62         fddi->fc                         = FDDI_FC_K_ASYNC_LLC_DEF;
 63         if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
 64         {
 65                 fddi->hdr.llc_snap.dsap          = FDDI_EXTENDED_SAP;
 66                 fddi->hdr.llc_snap.ssap          = FDDI_EXTENDED_SAP;
 67                 fddi->hdr.llc_snap.ctrl          = FDDI_UI_CMD;
 68                 fddi->hdr.llc_snap.oui[0]        = 0x00;
 69                 fddi->hdr.llc_snap.oui[1]        = 0x00;
 70                 fddi->hdr.llc_snap.oui[2]        = 0x00;
 71                 fddi->hdr.llc_snap.ethertype     = htons(type);
 72         }
 73 
 74         /* Set the source and destination hardware addresses */
 75 
 76         if (saddr != NULL)
 77                 memcpy(fddi->saddr, saddr, dev->addr_len);
 78         else
 79                 memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
 80 
 81         if (daddr != NULL)
 82         {
 83                 memcpy(fddi->daddr, daddr, dev->addr_len);
 84                 return hl;
 85         }
 86 
 87         return -hl;
 88 }
 89 
 90 
 91 /*
 92  * Rebuild the FDDI MAC header. This is called after an ARP
 93  * (or in future other address resolution) has completed on
 94  * this sk_buff.  We now let ARP fill in the other fields.
 95  */
 96 
 97 static int fddi_rebuild_header(struct sk_buff   *skb)
 98 {
 99         struct fddihdr *fddi = (struct fddihdr *)skb->data;
100 
101 #ifdef CONFIG_INET
102         if (fddi->hdr.llc_snap.ethertype == htons(ETH_P_IP))
103                 /* Try to get ARP to resolve the header and fill destination address */
104                 return arp_find(fddi->daddr, skb);
105         else
106 #endif
107         {
108                 printk("%s: Don't know how to resolve type %04X addresses.\n",
109                        skb->dev->name, ntohs(fddi->hdr.llc_snap.ethertype));
110                 return 0;
111         }
112 }
113 
114 
115 /*
116  * Determine the packet's protocol ID and fill in skb fields.
117  * This routine is called before an incoming packet is passed
118  * up.  It's used to fill in specific skb fields and to set
119  * the proper pointer to the start of packet data (skb->data).
120  */
121 
122 __be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
123 {
124         struct fddihdr *fddi = (struct fddihdr *)skb->data;
125         __be16 type;
126 
127         /*
128          * Set mac.raw field to point to FC byte, set data field to point
129          * to start of packet data.  Assume 802.2 SNAP frames for now.
130          */
131 
132         skb->dev = dev;
133         skb_reset_mac_header(skb);      /* point to frame control (FC) */
134 
135         if(fddi->hdr.llc_8022_1.dsap==0xe0)
136         {
137                 skb_pull(skb, FDDI_K_8022_HLEN-3);
138                 type = htons(ETH_P_802_2);
139         }
140         else
141         {
142                 skb_pull(skb, FDDI_K_SNAP_HLEN);                /* adjust for 21 byte header */
143                 type=fddi->hdr.llc_snap.ethertype;
144         }
145 
146         /* Set packet type based on destination address and flag settings */
147 
148         if (*fddi->daddr & 0x01)
149         {
150                 if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
151                         skb->pkt_type = PACKET_BROADCAST;
152                 else
153                         skb->pkt_type = PACKET_MULTICAST;
154         }
155 
156         else if (dev->flags & IFF_PROMISC)
157         {
158                 if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
159                         skb->pkt_type = PACKET_OTHERHOST;
160         }
161 
162         /* Assume 802.2 SNAP frames, for now */
163 
164         return type;
165 }
166 
167 EXPORT_SYMBOL(fddi_type_trans);
168 
169 int fddi_change_mtu(struct net_device *dev, int new_mtu)
170 {
171         if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
172                 return -EINVAL;
173         dev->mtu = new_mtu;
174         return 0;
175 }
176 EXPORT_SYMBOL(fddi_change_mtu);
177 
178 static const struct header_ops fddi_header_ops = {
179         .create         = fddi_header,
180         .rebuild        = fddi_rebuild_header,
181 };
182 
183 
184 static void fddi_setup(struct net_device *dev)
185 {
186         dev->header_ops         = &fddi_header_ops;
187         dev->type               = ARPHRD_FDDI;
188         dev->hard_header_len    = FDDI_K_SNAP_HLEN+3;   /* Assume 802.2 SNAP hdr len + 3 pad bytes */
189         dev->mtu                = FDDI_K_SNAP_DLEN;     /* Assume max payload of 802.2 SNAP frame */
190         dev->addr_len           = FDDI_K_ALEN;
191         dev->tx_queue_len       = 100;                  /* Long queues on FDDI */
192         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
193 
194         memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
195 }
196 
197 /**
198  * alloc_fddidev - Register FDDI device
199  * @sizeof_priv: Size of additional driver-private structure to be allocated
200  *      for this FDDI device
201  *
202  * Fill in the fields of the device structure with FDDI-generic values.
203  *
204  * Constructs a new net device, complete with a private data area of
205  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
206  * this private data area.
207  */
208 struct net_device *alloc_fddidev(int sizeof_priv)
209 {
210         return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
211                             fddi_setup);
212 }
213 EXPORT_SYMBOL(alloc_fddidev);
214 
215 MODULE_LICENSE("GPL");
216 

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