Root/net/802/hippi.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 * 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
46static 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 * Rebuild the HIPPI MAC header. This is called after an ARP has
95 * completed on this sk_buff. We now let ARP fill in the other fields.
96 */
97
98static int hippi_rebuild_header(struct sk_buff *skb)
99{
100    struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
101
102    /*
103     * Only IP is currently supported
104     */
105
106    if(hip->snap.ethertype != htons(ETH_P_IP))
107    {
108        printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
109        return 0;
110    }
111
112    /*
113     * We don't support dynamic ARP on HIPPI, but we use the ARP
114     * static ARP tables to hold the I-FIELDs.
115     */
116    return arp_find(hip->le.daddr, skb);
117}
118
119
120/*
121 * Determine the packet's protocol ID.
122 */
123
124__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
125{
126    struct hippi_hdr *hip;
127
128    /*
129     * This is actually wrong ... question is if we really should
130     * set the raw address here.
131     */
132    skb->dev = dev;
133    skb_reset_mac_header(skb);
134    hip = (struct hippi_hdr *)skb_mac_header(skb);
135    skb_pull(skb, HIPPI_HLEN);
136
137    /*
138     * No fancy promisc stuff here now.
139     */
140
141    return hip->snap.ethertype;
142}
143
144EXPORT_SYMBOL(hippi_type_trans);
145
146int hippi_change_mtu(struct net_device *dev, int new_mtu)
147{
148    /*
149     * HIPPI's got these nice large MTUs.
150     */
151    if ((new_mtu < 68) || (new_mtu > 65280))
152        return -EINVAL;
153    dev->mtu = new_mtu;
154    return 0;
155}
156EXPORT_SYMBOL(hippi_change_mtu);
157
158/*
159 * For HIPPI we will actually use the lower 4 bytes of the hardware
160 * address as the I-FIELD rather than the actual hardware address.
161 */
162int hippi_mac_addr(struct net_device *dev, void *p)
163{
164    struct sockaddr *addr = p;
165    if (netif_running(dev))
166        return -EBUSY;
167    memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
168    return 0;
169}
170EXPORT_SYMBOL(hippi_mac_addr);
171
172int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
173{
174    /* Never send broadcast/multicast ARP messages */
175    p->mcast_probes = 0;
176
177    /* In IPv6 unicast probes are valid even on NBMA,
178    * because they are encapsulated in normal IPv6 protocol.
179    * Should be a generic flag.
180    */
181    if (p->tbl->family != AF_INET6)
182        p->ucast_probes = 0;
183    return 0;
184}
185EXPORT_SYMBOL(hippi_neigh_setup_dev);
186
187static const struct header_ops hippi_header_ops = {
188    .create = hippi_header,
189    .rebuild = hippi_rebuild_header,
190};
191
192
193static void hippi_setup(struct net_device *dev)
194{
195    dev->header_ops = &hippi_header_ops;
196
197    /*
198     * We don't support HIPPI `ARP' for the time being, and probably
199     * never will unless someone else implements it. However we
200     * still need a fake ARPHRD to make ifconfig and friends play ball.
201     */
202    dev->type = ARPHRD_HIPPI;
203    dev->hard_header_len = HIPPI_HLEN;
204    dev->mtu = 65280;
205    dev->addr_len = HIPPI_ALEN;
206    dev->tx_queue_len = 25 /* 5 */;
207    memset(dev->broadcast, 0xFF, HIPPI_ALEN);
208
209
210    /*
211     * HIPPI doesn't support broadcast+multicast and we only use
212     * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
213     */
214    dev->flags = 0;
215}
216
217/**
218 * alloc_hippi_dev - Register HIPPI device
219 * @sizeof_priv: Size of additional driver-private structure to be allocated
220 * for this HIPPI device
221 *
222 * Fill in the fields of the device structure with HIPPI-generic values.
223 *
224 * Constructs a new net device, complete with a private data area of
225 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
226 * this private data area.
227 */
228
229struct net_device *alloc_hippi_dev(int sizeof_priv)
230{
231    return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
232}
233
234EXPORT_SYMBOL(alloc_hippi_dev);
235

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