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Linux/net/802/fddi.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              FDDI-type device handling.
  8  *
  9  * Version:     @(#)fddi.c      1.0.0   08/12/96
 10  *
 11  * Authors:     Lawrence V. Stefani, <stefani@lkg.dec.com>
 12  *
 13  *              fddi.c is based on previous eth.c and tr.c work by
 14  *                      Ross Biro
 15  *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 16  *                      Mark Evans, <evansmp@uhura.aston.ac.uk>
 17  *                      Florian La Roche, <rzsfl@rz.uni-sb.de>
 18  *                      Alan Cox, <gw4pts@gw4pts.ampr.org>
 19  *
 20  *      Changes
 21  *              Alan Cox                :       New arp/rebuild header
 22  *              Maciej W. Rozycki       :       IPv6 support
 23  */
 24 
 25 #include <linux/module.h>
 26 #include <linux/types.h>
 27 #include <linux/kernel.h>
 28 #include <linux/string.h>
 29 #include <linux/mm.h>
 30 #include <linux/socket.h>
 31 #include <linux/in.h>
 32 #include <linux/inet.h>
 33 #include <linux/netdevice.h>
 34 #include <linux/fddidevice.h>
 35 #include <linux/if_ether.h>
 36 #include <linux/skbuff.h>
 37 #include <linux/errno.h>
 38 #include <net/arp.h>
 39 #include <net/sock.h>
 40 
 41 /*
 42  * Create the FDDI MAC header for an arbitrary protocol layer
 43  *
 44  * saddr=NULL   means use device source address
 45  * daddr=NULL   means leave destination address (eg unresolved arp)
 46  */
 47 
 48 static int fddi_header(struct sk_buff *skb, struct net_device *dev,
 49                        unsigned short type,
 50                        const void *daddr, const void *saddr, unsigned int len)
 51 {
 52         int hl = FDDI_K_SNAP_HLEN;
 53         struct fddihdr *fddi;
 54 
 55         if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
 56                 hl=FDDI_K_8022_HLEN-3;
 57         fddi = skb_push(skb, hl);
 58         fddi->fc                         = FDDI_FC_K_ASYNC_LLC_DEF;
 59         if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
 60         {
 61                 fddi->hdr.llc_snap.dsap          = FDDI_EXTENDED_SAP;
 62                 fddi->hdr.llc_snap.ssap          = FDDI_EXTENDED_SAP;
 63                 fddi->hdr.llc_snap.ctrl          = FDDI_UI_CMD;
 64                 fddi->hdr.llc_snap.oui[0]        = 0x00;
 65                 fddi->hdr.llc_snap.oui[1]        = 0x00;
 66                 fddi->hdr.llc_snap.oui[2]        = 0x00;
 67                 fddi->hdr.llc_snap.ethertype     = htons(type);
 68         }
 69 
 70         /* Set the source and destination hardware addresses */
 71 
 72         if (saddr != NULL)
 73                 memcpy(fddi->saddr, saddr, dev->addr_len);
 74         else
 75                 memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
 76 
 77         if (daddr != NULL)
 78         {
 79                 memcpy(fddi->daddr, daddr, dev->addr_len);
 80                 return hl;
 81         }
 82 
 83         return -hl;
 84 }
 85 
 86 /*
 87  * Determine the packet's protocol ID and fill in skb fields.
 88  * This routine is called before an incoming packet is passed
 89  * up.  It's used to fill in specific skb fields and to set
 90  * the proper pointer to the start of packet data (skb->data).
 91  */
 92 
 93 __be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
 94 {
 95         struct fddihdr *fddi = (struct fddihdr *)skb->data;
 96         __be16 type;
 97 
 98         /*
 99          * Set mac.raw field to point to FC byte, set data field to point
100          * to start of packet data.  Assume 802.2 SNAP frames for now.
101          */
102 
103         skb->dev = dev;
104         skb_reset_mac_header(skb);      /* point to frame control (FC) */
105 
106         if(fddi->hdr.llc_8022_1.dsap==0xe0)
107         {
108                 skb_pull(skb, FDDI_K_8022_HLEN-3);
109                 type = htons(ETH_P_802_2);
110         }
111         else
112         {
113                 skb_pull(skb, FDDI_K_SNAP_HLEN);                /* adjust for 21 byte header */
114                 type=fddi->hdr.llc_snap.ethertype;
115         }
116 
117         /* Set packet type based on destination address and flag settings */
118 
119         if (*fddi->daddr & 0x01)
120         {
121                 if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
122                         skb->pkt_type = PACKET_BROADCAST;
123                 else
124                         skb->pkt_type = PACKET_MULTICAST;
125         }
126 
127         else if (dev->flags & IFF_PROMISC)
128         {
129                 if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
130                         skb->pkt_type = PACKET_OTHERHOST;
131         }
132 
133         /* Assume 802.2 SNAP frames, for now */
134 
135         return type;
136 }
137 
138 EXPORT_SYMBOL(fddi_type_trans);
139 
140 static const struct header_ops fddi_header_ops = {
141         .create         = fddi_header,
142 };
143 
144 
145 static void fddi_setup(struct net_device *dev)
146 {
147         dev->header_ops         = &fddi_header_ops;
148         dev->type               = ARPHRD_FDDI;
149         dev->hard_header_len    = FDDI_K_SNAP_HLEN+3;   /* Assume 802.2 SNAP hdr len + 3 pad bytes */
150         dev->mtu                = FDDI_K_SNAP_DLEN;     /* Assume max payload of 802.2 SNAP frame */
151         dev->min_mtu            = FDDI_K_SNAP_HLEN;
152         dev->max_mtu            = FDDI_K_SNAP_DLEN;
153         dev->addr_len           = FDDI_K_ALEN;
154         dev->tx_queue_len       = 100;                  /* Long queues on FDDI */
155         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
156 
157         memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
158 }
159 
160 /**
161  * alloc_fddidev - Register FDDI device
162  * @sizeof_priv: Size of additional driver-private structure to be allocated
163  *      for this FDDI device
164  *
165  * Fill in the fields of the device structure with FDDI-generic values.
166  *
167  * Constructs a new net device, complete with a private data area of
168  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
169  * this private data area.
170  */
171 struct net_device *alloc_fddidev(int sizeof_priv)
172 {
173         return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
174                             fddi_setup);
175 }
176 EXPORT_SYMBOL(alloc_fddidev);
177 
178 MODULE_LICENSE("GPL");
179 

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