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.
6 * HIPPI-type device handling.
8 * Version: @(#)hippi.c 1.0.0 05/29/97
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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>
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.
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>
29 #include <linux/socket.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>
38 #include <asm/uaccess.h>
39 #include <asm/checksum.h>
40 #include <asm/system.h>
45 * Do nothing, this is just to pursuade the stupid linker to behave.
48 void hippi_net_init(void)
54 * Create the HIPPI MAC header for an arbitrary protocol layer
56 * saddr=NULL means use device source address
57 * daddr=NULL means leave destination address (eg unresolved arp)
60 int hippi_header(struct sk_buff *skb, struct net_device *dev,
61 unsigned short type, void *daddr, void *saddr,
64 struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
67 len = skb->len - HIPPI_HLEN;
68 printk("hippi_header(): length not supplied\n");
72 * Due to the stupidity of the little endian byte-order we
73 * have to set the fp field this way.
75 hip->fp.fixed = __constant_htonl(0x04800018);
76 hip->fp.d2_size = htonl(len + 8);
78 hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
79 hip->le.message_type = 0; /* Data PDU */
81 hip->le.dest_addr_type = 2; /* 12 bit SC address */
82 hip->le.src_addr_type = 2; /* 12 bit SC address */
84 memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
85 memset(&hip->le.reserved, 0, 16);
87 hip->snap.dsap = HIPPI_EXTENDED_SAP;
88 hip->snap.ssap = HIPPI_EXTENDED_SAP;
89 hip->snap.ctrl = HIPPI_UI_CMD;
90 hip->snap.oui[0] = 0x00;
91 hip->snap.oui[1] = 0x00;
92 hip->snap.oui[2] = 0x00;
93 hip->snap.ethertype = htons(type);
97 memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
98 memcpy(&skb->private.ifield, daddr + 2, 4);
101 return -((int)HIPPI_HLEN);
106 * Rebuild the HIPPI MAC header. This is called after an ARP has
107 * completed on this sk_buff. We now let ARP fill in the other fields.
110 int hippi_rebuild_header(struct sk_buff *skb)
112 struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
115 * Only IP is currently supported
118 if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
120 printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
125 * We don't support dynamic ARP on HIPPI, but we use the ARP
126 * static ARP tables to hold the I-FIELDs.
128 return arp_find(hip->le.daddr, skb);
133 * Determine the packet's protocol ID.
136 unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
138 struct hippi_hdr *hip;
140 hip = (struct hippi_hdr *) skb->data;
143 * This is actually wrong ... question is if we really should
144 * set the raw address here.
146 skb->mac.raw = skb->data;
147 skb_pull(skb, HIPPI_HLEN);
150 * No fancy promisc stuff here now.
153 return hip->snap.ethertype;
156 EXPORT_SYMBOL(hippi_type_trans);
158 static int hippi_change_mtu(struct net_device *dev, int new_mtu)
161 * HIPPI's got these nice large MTUs.
163 if ((new_mtu < 68) || (new_mtu > 65280))
170 * For HIPPI we will actually use the lower 4 bytes of the hardware
171 * address as the I-FIELD rather than the actual hardware address.
173 static int hippi_mac_addr(struct net_device *dev, void *p)
175 struct sockaddr *addr = p;
176 if (netif_running(dev))
178 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
182 static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
184 /* Never send broadcast/multicast ARP messages */
187 /* In IPv6 unicast probes are valid even on NBMA,
188 * because they are encapsulated in normal IPv6 protocol.
189 * Should be a generic flag.
191 if (p->tbl->family != AF_INET6)
196 static void hippi_setup(struct net_device *dev)
198 dev->set_multicast_list = NULL;
199 dev->change_mtu = hippi_change_mtu;
200 dev->hard_header = hippi_header;
201 dev->rebuild_header = hippi_rebuild_header;
202 dev->set_mac_address = hippi_mac_addr;
203 dev->hard_header_parse = NULL;
204 dev->hard_header_cache = NULL;
205 dev->header_cache_update = NULL;
206 dev->neigh_setup = hippi_neigh_setup_dev;
209 * We don't support HIPPI `ARP' for the time being, and probably
210 * never will unless someone else implements it. However we
211 * still need a fake ARPHRD to make ifconfig and friends play ball.
213 dev->type = ARPHRD_HIPPI;
214 dev->hard_header_len = HIPPI_HLEN;
216 dev->addr_len = HIPPI_ALEN;
217 dev->tx_queue_len = 25 /* 5 */;
218 memset(dev->broadcast, 0xFF, HIPPI_ALEN);
222 * HIPPI doesn't support broadcast+multicast and we only use
223 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
229 * alloc_hippi_dev - Register HIPPI device
230 * @sizeof_priv: Size of additional driver-private structure to be allocated
231 * for this HIPPI device
233 * Fill in the fields of the device structure with HIPPI-generic values.
235 * Constructs a new net device, complete with a private data area of
236 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
237 * this private data area.
240 struct net_device *alloc_hippi_dev(int sizeof_priv)
242 return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
245 EXPORT_SYMBOL(alloc_hippi_dev);