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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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/sched.h>
27#include <linux/string.h>
28#include <linux/mm.h>
29#include <linux/socket.h>
30#include <linux/in.h>
31#include <linux/inet.h>
32#include <linux/netdevice.h>
33#include <linux/hippidevice.h>
34#include <linux/skbuff.h>
35#include <linux/errno.h>
36#include <net/arp.h>
37#include <net/sock.h>
38#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/system.h>
40
41/*
42 * Create the HIPPI 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
48static int hippi_header(struct sk_buff *skb, struct net_device *dev,
49 unsigned short type, void *daddr, void *saddr,
50 unsigned len)
51{
52 struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070053 struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55 if (!len){
56 len = skb->len - HIPPI_HLEN;
57 printk("hippi_header(): length not supplied\n");
58 }
59
60 /*
61 * Due to the stupidity of the little endian byte-order we
62 * have to set the fp field this way.
63 */
64 hip->fp.fixed = __constant_htonl(0x04800018);
65 hip->fp.d2_size = htonl(len + 8);
66 hip->le.fc = 0;
67 hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
68 hip->le.message_type = 0; /* Data PDU */
69
70 hip->le.dest_addr_type = 2; /* 12 bit SC address */
71 hip->le.src_addr_type = 2; /* 12 bit SC address */
72
73 memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
74 memset(&hip->le.reserved, 0, 16);
75
76 hip->snap.dsap = HIPPI_EXTENDED_SAP;
77 hip->snap.ssap = HIPPI_EXTENDED_SAP;
78 hip->snap.ctrl = HIPPI_UI_CMD;
79 hip->snap.oui[0] = 0x00;
80 hip->snap.oui[1] = 0x00;
81 hip->snap.oui[2] = 0x00;
82 hip->snap.ethertype = htons(type);
83
84 if (daddr)
85 {
86 memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070087 memcpy(&hcb->ifield, daddr + 2, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return HIPPI_HLEN;
89 }
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070090 hcb->ifield = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return -((int)HIPPI_HLEN);
92}
93
94
95/*
96 * Rebuild the HIPPI MAC header. This is called after an ARP has
97 * completed on this sk_buff. We now let ARP fill in the other fields.
98 */
99
100static int hippi_rebuild_header(struct sk_buff *skb)
101{
102 struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
103
104 /*
105 * Only IP is currently supported
106 */
107
108 if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
109 {
110 printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
111 return 0;
112 }
113
114 /*
115 * We don't support dynamic ARP on HIPPI, but we use the ARP
116 * static ARP tables to hold the I-FIELDs.
117 */
118 return arp_find(hip->le.daddr, skb);
119}
120
121
122/*
123 * Determine the packet's protocol ID.
124 */
125
Alexey Dobriyan57bf1452005-08-25 16:06:19 -0700126__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
128 struct hippi_hdr *hip;
129
130 hip = (struct hippi_hdr *) skb->data;
131
132 /*
133 * This is actually wrong ... question is if we really should
134 * set the raw address here.
135 */
136 skb->mac.raw = skb->data;
137 skb_pull(skb, HIPPI_HLEN);
138
139 /*
140 * No fancy promisc stuff here now.
141 */
142
143 return hip->snap.ethertype;
144}
145
146EXPORT_SYMBOL(hippi_type_trans);
147
148static int hippi_change_mtu(struct net_device *dev, int new_mtu)
149{
150 /*
151 * HIPPI's got these nice large MTUs.
152 */
153 if ((new_mtu < 68) || (new_mtu > 65280))
154 return -EINVAL;
155 dev->mtu = new_mtu;
156 return(0);
157}
158
159/*
160 * For HIPPI we will actually use the lower 4 bytes of the hardware
161 * address as the I-FIELD rather than the actual hardware address.
162 */
163static int hippi_mac_addr(struct net_device *dev, void *p)
164{
165 struct sockaddr *addr = p;
166 if (netif_running(dev))
167 return -EBUSY;
168 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
169 return 0;
170}
171
172static int 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}
185
186static void hippi_setup(struct net_device *dev)
187{
188 dev->set_multicast_list = NULL;
189 dev->change_mtu = hippi_change_mtu;
190 dev->hard_header = hippi_header;
191 dev->rebuild_header = hippi_rebuild_header;
192 dev->set_mac_address = hippi_mac_addr;
193 dev->hard_header_parse = NULL;
194 dev->hard_header_cache = NULL;
195 dev->header_cache_update = NULL;
196 dev->neigh_setup = hippi_neigh_setup_dev;
197
198 /*
199 * We don't support HIPPI `ARP' for the time being, and probably
200 * never will unless someone else implements it. However we
201 * still need a fake ARPHRD to make ifconfig and friends play ball.
202 */
203 dev->type = ARPHRD_HIPPI;
204 dev->hard_header_len = HIPPI_HLEN;
205 dev->mtu = 65280;
206 dev->addr_len = HIPPI_ALEN;
207 dev->tx_queue_len = 25 /* 5 */;
208 memset(dev->broadcast, 0xFF, HIPPI_ALEN);
209
210
211 /*
212 * HIPPI doesn't support broadcast+multicast and we only use
213 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
214 */
215 dev->flags = 0;
216}
217
218/**
219 * alloc_hippi_dev - Register HIPPI device
220 * @sizeof_priv: Size of additional driver-private structure to be allocated
221 * for this HIPPI device
222 *
223 * Fill in the fields of the device structure with HIPPI-generic values.
224 *
225 * Constructs a new net device, complete with a private data area of
226 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
227 * this private data area.
228 */
229
230struct net_device *alloc_hippi_dev(int sizeof_priv)
231{
232 return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
233}
234
235EXPORT_SYMBOL(alloc_hippi_dev);