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Linux/net/802/hippi.c

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  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  *              HIPPI-type device handling.
  7  *
  8  * Version:     @(#)hippi.c     1.0.0   05/29/97
  9  *
 10  * Authors:     Ross Biro
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  *              Mark Evans, <evansmp@uhura.aston.ac.uk>
 13  *              Florian  La Roche, <rzsfl@rz.uni-sb.de>
 14  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 15  *              Jes Sorensen, <Jes.Sorensen@cern.ch>
 16  *
 17  *              This program is free software; you can redistribute it and/or
 18  *              modify it under the terms of the GNU General Public License
 19  *              as published by the Free Software Foundation; either version
 20  *              2 of the License, or (at your option) any later version.
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/types.h>
 25 #include <linux/kernel.h>
 26 #include <linux/string.h>
 27 #include <linux/mm.h>
 28 #include <linux/socket.h>
 29 #include <linux/in.h>
 30 #include <linux/inet.h>
 31 #include <linux/netdevice.h>
 32 #include <linux/hippidevice.h>
 33 #include <linux/skbuff.h>
 34 #include <linux/errno.h>
 35 #include <net/arp.h>
 36 #include <net/sock.h>
 37 #include <asm/uaccess.h>
 38 
 39 /*
 40  * Create the HIPPI MAC header for an arbitrary protocol layer
 41  *
 42  * saddr=NULL   means use device source address
 43  * daddr=NULL   means leave destination address (eg unresolved arp)
 44  */
 45 
 46 static int hippi_header(struct sk_buff *skb, struct net_device *dev,
 47                         unsigned short type,
 48                         const void *daddr, const void *saddr, unsigned int len)
 49 {
 50         struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
 51         struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
 52 
 53         if (!len){
 54                 len = skb->len - HIPPI_HLEN;
 55                 printk("hippi_header(): length not supplied\n");
 56         }
 57 
 58         /*
 59          * Due to the stupidity of the little endian byte-order we
 60          * have to set the fp field this way.
 61          */
 62         hip->fp.fixed           = htonl(0x04800018);
 63         hip->fp.d2_size         = htonl(len + 8);
 64         hip->le.fc              = 0;
 65         hip->le.double_wide     = 0;    /* only HIPPI 800 for the time being */
 66         hip->le.message_type    = 0;    /* Data PDU */
 67 
 68         hip->le.dest_addr_type  = 2;    /* 12 bit SC address */
 69         hip->le.src_addr_type   = 2;    /* 12 bit SC address */
 70 
 71         memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
 72         memset(&hip->le.reserved, 0, 16);
 73 
 74         hip->snap.dsap          = HIPPI_EXTENDED_SAP;
 75         hip->snap.ssap          = HIPPI_EXTENDED_SAP;
 76         hip->snap.ctrl          = HIPPI_UI_CMD;
 77         hip->snap.oui[0]        = 0x00;
 78         hip->snap.oui[1]        = 0x00;
 79         hip->snap.oui[2]        = 0x00;
 80         hip->snap.ethertype     = htons(type);
 81 
 82         if (daddr)
 83         {
 84                 memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
 85                 memcpy(&hcb->ifield, daddr + 2, 4);
 86                 return HIPPI_HLEN;
 87         }
 88         hcb->ifield = 0;
 89         return -((int)HIPPI_HLEN);
 90 }
 91 
 92 
 93 /*
 94  *      Determine the packet's protocol ID.
 95  */
 96 
 97 __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
 98 {
 99         struct hippi_hdr *hip;
100 
101         /*
102          * This is actually wrong ... question is if we really should
103          * set the raw address here.
104          */
105         skb->dev = dev;
106         skb_reset_mac_header(skb);
107         hip = (struct hippi_hdr *)skb_mac_header(skb);
108         skb_pull(skb, HIPPI_HLEN);
109 
110         /*
111          * No fancy promisc stuff here now.
112          */
113 
114         return hip->snap.ethertype;
115 }
116 
117 EXPORT_SYMBOL(hippi_type_trans);
118 
119 int hippi_change_mtu(struct net_device *dev, int new_mtu)
120 {
121         /*
122          * HIPPI's got these nice large MTUs.
123          */
124         if ((new_mtu < 68) || (new_mtu > 65280))
125                 return -EINVAL;
126         dev->mtu = new_mtu;
127         return 0;
128 }
129 EXPORT_SYMBOL(hippi_change_mtu);
130 
131 /*
132  * For HIPPI we will actually use the lower 4 bytes of the hardware
133  * address as the I-FIELD rather than the actual hardware address.
134  */
135 int hippi_mac_addr(struct net_device *dev, void *p)
136 {
137         struct sockaddr *addr = p;
138         if (netif_running(dev))
139                 return -EBUSY;
140         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
141         return 0;
142 }
143 EXPORT_SYMBOL(hippi_mac_addr);
144 
145 int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
146 {
147         /* Never send broadcast/multicast ARP messages */
148         NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
149 
150         /* In IPv6 unicast probes are valid even on NBMA,
151         * because they are encapsulated in normal IPv6 protocol.
152         * Should be a generic flag.
153         */
154         if (p->tbl->family != AF_INET6)
155                 NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
156         return 0;
157 }
158 EXPORT_SYMBOL(hippi_neigh_setup_dev);
159 
160 static const struct header_ops hippi_header_ops = {
161         .create         = hippi_header,
162 };
163 
164 
165 static void hippi_setup(struct net_device *dev)
166 {
167         dev->header_ops                 = &hippi_header_ops;
168 
169         /*
170          * We don't support HIPPI `ARP' for the time being, and probably
171          * never will unless someone else implements it. However we
172          * still need a fake ARPHRD to make ifconfig and friends play ball.
173          */
174         dev->type               = ARPHRD_HIPPI;
175         dev->hard_header_len    = HIPPI_HLEN;
176         dev->mtu                = 65280;
177         dev->addr_len           = HIPPI_ALEN;
178         dev->tx_queue_len       = 25 /* 5 */;
179         memset(dev->broadcast, 0xFF, HIPPI_ALEN);
180 
181 
182         /*
183          * HIPPI doesn't support broadcast+multicast and we only use
184          * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
185          */
186         dev->flags = 0;
187 }
188 
189 /**
190  * alloc_hippi_dev - Register HIPPI device
191  * @sizeof_priv: Size of additional driver-private structure to be allocated
192  *      for this HIPPI device
193  *
194  * Fill in the fields of the device structure with HIPPI-generic values.
195  *
196  * Constructs a new net device, complete with a private data area of
197  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
198  * this private data area.
199  */
200 
201 struct net_device *alloc_hippi_dev(int sizeof_priv)
202 {
203         return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
204                             hippi_setup);
205 }
206 
207 EXPORT_SYMBOL(alloc_hippi_dev);
208 

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