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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/system.h>
39
40/*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090041 * Create the HIPPI MAC header for an arbitrary protocol layer
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 *
43 * saddr=NULL means use device source address
44 * daddr=NULL means leave destination address (eg unresolved arp)
45 */
46
47static int hippi_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070048 unsigned short type,
49 const void *daddr, const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070052 struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 if (!len){
55 len = skb->len - HIPPI_HLEN;
56 printk("hippi_header(): length not supplied\n");
57 }
58
59 /*
60 * Due to the stupidity of the little endian byte-order we
61 * have to set the fp field this way.
62 */
YOSHIFUJI Hideaki2953fd22007-03-25 20:11:55 -070063 hip->fp.fixed = htonl(0x04800018);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 hip->fp.d2_size = htonl(len + 8);
65 hip->le.fc = 0;
66 hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
67 hip->le.message_type = 0; /* Data PDU */
68
69 hip->le.dest_addr_type = 2; /* 12 bit SC address */
70 hip->le.src_addr_type = 2; /* 12 bit SC address */
71
72 memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
73 memset(&hip->le.reserved, 0, 16);
74
75 hip->snap.dsap = HIPPI_EXTENDED_SAP;
76 hip->snap.ssap = HIPPI_EXTENDED_SAP;
77 hip->snap.ctrl = HIPPI_UI_CMD;
78 hip->snap.oui[0] = 0x00;
79 hip->snap.oui[1] = 0x00;
80 hip->snap.oui[2] = 0x00;
81 hip->snap.ethertype = htons(type);
82
83 if (daddr)
84 {
85 memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070086 memcpy(&hcb->ifield, daddr + 2, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 return HIPPI_HLEN;
88 }
Stephen Hemminger6f1cf162005-08-09 19:31:17 -070089 hcb->ifield = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return -((int)HIPPI_HLEN);
91}
92
93
94/*
95 * Rebuild the HIPPI MAC header. This is called after an ARP has
96 * completed on this sk_buff. We now let ARP fill in the other fields.
97 */
98
99static int hippi_rebuild_header(struct sk_buff *skb)
100{
101 struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
102
103 /*
104 * Only IP is currently supported
105 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900106
YOSHIFUJI Hideaki2953fd22007-03-25 20:11:55 -0700107 if(hip->snap.ethertype != htons(ETH_P_IP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 {
109 printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
110 return 0;
111 }
112
113 /*
114 * We don't support dynamic ARP on HIPPI, but we use the ARP
115 * static ARP tables to hold the I-FIELDs.
116 */
117 return arp_find(hip->le.daddr, skb);
118}
119
120
121/*
122 * Determine the packet's protocol ID.
123 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900124
Alexey Dobriyan57bf1452005-08-25 16:06:19 -0700125__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 struct hippi_hdr *hip;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 /*
130 * This is actually wrong ... question is if we really should
131 * set the raw address here.
132 */
Arnaldo Carvalho de Melo0a4f23f2007-03-10 10:57:13 -0300133 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700134 skb_reset_mac_header(skb);
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700135 hip = (struct hippi_hdr *)skb_mac_header(skb);
Arnaldo Carvalho de Melo0a4f23f2007-03-10 10:57:13 -0300136 skb_pull(skb, HIPPI_HLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 /*
139 * No fancy promisc stuff here now.
140 */
141
142 return hip->snap.ethertype;
143}
144
145EXPORT_SYMBOL(hippi_type_trans);
146
147static int hippi_change_mtu(struct net_device *dev, int new_mtu)
148{
149 /*
150 * HIPPI's got these nice large MTUs.
151 */
152 if ((new_mtu < 68) || (new_mtu > 65280))
153 return -EINVAL;
154 dev->mtu = new_mtu;
155 return(0);
156}
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 */
162static int 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}
170
171static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
172{
173 /* Never send broadcast/multicast ARP messages */
174 p->mcast_probes = 0;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 /* In IPv6 unicast probes are valid even on NBMA,
177 * because they are encapsulated in normal IPv6 protocol.
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900178 * Should be a generic flag.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
180 if (p->tbl->family != AF_INET6)
181 p->ucast_probes = 0;
182 return 0;
183}
184
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700185static const struct header_ops hippi_header_ops = {
186 .create = hippi_header,
187 .rebuild = hippi_rebuild_header,
188};
189
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191static void hippi_setup(struct net_device *dev)
192{
193 dev->set_multicast_list = NULL;
194 dev->change_mtu = hippi_change_mtu;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700195 dev->header_ops = &hippi_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 dev->set_mac_address = hippi_mac_addr;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900197 dev->neigh_setup = hippi_neigh_setup_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 /*
200 * We don't support HIPPI `ARP' for the time being, and probably
201 * never will unless someone else implements it. However we
202 * still need a fake ARPHRD to make ifconfig and friends play ball.
203 */
204 dev->type = ARPHRD_HIPPI;
205 dev->hard_header_len = HIPPI_HLEN;
206 dev->mtu = 65280;
207 dev->addr_len = HIPPI_ALEN;
208 dev->tx_queue_len = 25 /* 5 */;
209 memset(dev->broadcast, 0xFF, HIPPI_ALEN);
210
211
212 /*
213 * HIPPI doesn't support broadcast+multicast and we only use
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900214 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900216 dev->flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
219/**
220 * alloc_hippi_dev - Register HIPPI device
221 * @sizeof_priv: Size of additional driver-private structure to be allocated
222 * for this HIPPI device
223 *
224 * Fill in the fields of the device structure with HIPPI-generic values.
225 *
226 * Constructs a new net device, complete with a private data area of
227 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
228 * this private data area.
229 */
230
231struct net_device *alloc_hippi_dev(int sizeof_priv)
232{
233 return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
234}
235
236EXPORT_SYMBOL(alloc_hippi_dev);