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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
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 * 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
117EXPORT_SYMBOL(hippi_type_trans);
118
119int 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}
129EXPORT_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 */
135int 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}
143EXPORT_SYMBOL(hippi_mac_addr);
144
145int 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}
158EXPORT_SYMBOL(hippi_neigh_setup_dev);
159
160static const struct header_ops hippi_header_ops = {
161 .create = hippi_header,
162};
163
164
165static 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
201struct 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
207EXPORT_SYMBOL(alloc_hippi_dev);
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 <linux/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 = 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
117EXPORT_SYMBOL(hippi_type_trans);
118
119/*
120 * For HIPPI we will actually use the lower 4 bytes of the hardware
121 * address as the I-FIELD rather than the actual hardware address.
122 */
123int hippi_mac_addr(struct net_device *dev, void *p)
124{
125 struct sockaddr *addr = p;
126 if (netif_running(dev))
127 return -EBUSY;
128 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
129 return 0;
130}
131EXPORT_SYMBOL(hippi_mac_addr);
132
133int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
134{
135 /* Never send broadcast/multicast ARP messages */
136 NEIGH_VAR_INIT(p, MCAST_PROBES, 0);
137
138 /* In IPv6 unicast probes are valid even on NBMA,
139 * because they are encapsulated in normal IPv6 protocol.
140 * Should be a generic flag.
141 */
142 if (p->tbl->family != AF_INET6)
143 NEIGH_VAR_INIT(p, UCAST_PROBES, 0);
144 return 0;
145}
146EXPORT_SYMBOL(hippi_neigh_setup_dev);
147
148static const struct header_ops hippi_header_ops = {
149 .create = hippi_header,
150};
151
152
153static void hippi_setup(struct net_device *dev)
154{
155 dev->header_ops = &hippi_header_ops;
156
157 /*
158 * We don't support HIPPI `ARP' for the time being, and probably
159 * never will unless someone else implements it. However we
160 * still need a fake ARPHRD to make ifconfig and friends play ball.
161 */
162 dev->type = ARPHRD_HIPPI;
163 dev->hard_header_len = HIPPI_HLEN;
164 dev->mtu = 65280;
165 dev->min_mtu = 68;
166 dev->max_mtu = 65280;
167 dev->addr_len = HIPPI_ALEN;
168 dev->tx_queue_len = 25 /* 5 */;
169 memset(dev->broadcast, 0xFF, HIPPI_ALEN);
170
171
172 /*
173 * HIPPI doesn't support broadcast+multicast and we only use
174 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
175 */
176 dev->flags = 0;
177}
178
179/**
180 * alloc_hippi_dev - Register HIPPI device
181 * @sizeof_priv: Size of additional driver-private structure to be allocated
182 * for this HIPPI device
183 *
184 * Fill in the fields of the device structure with HIPPI-generic values.
185 *
186 * Constructs a new net device, complete with a private data area of
187 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
188 * this private data area.
189 */
190
191struct net_device *alloc_hippi_dev(int sizeof_priv)
192{
193 return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN,
194 hippi_setup);
195}
196
197EXPORT_SYMBOL(alloc_hippi_dev);