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
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/string.h>
28 #include <linux/socket.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>
37 #include <asm/uaccess.h>
38 #include <asm/system.h>
41 * Create the HIPPI MAC header for an arbitrary protocol layer
43 * saddr=NULL means use device source address
44 * daddr=NULL means leave destination address (eg unresolved arp)
47 static int hippi_header(struct sk_buff *skb, struct net_device *dev,
48 unsigned short type, void *daddr, void *saddr,
51 struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
52 struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;
55 len = skb->len - HIPPI_HLEN;
56 printk("hippi_header(): length not supplied\n");
60 * Due to the stupidity of the little endian byte-order we
61 * have to set the fp field this way.
63 hip->fp.fixed = htonl(0x04800018);
64 hip->fp.d2_size = htonl(len + 8);
66 hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
67 hip->le.message_type = 0; /* Data PDU */
69 hip->le.dest_addr_type = 2; /* 12 bit SC address */
70 hip->le.src_addr_type = 2; /* 12 bit SC address */
72 memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
73 memset(&hip->le.reserved, 0, 16);
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);
85 memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
86 memcpy(&hcb->ifield, daddr + 2, 4);
90 return -((int)HIPPI_HLEN);
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.
99 static int hippi_rebuild_header(struct sk_buff *skb)
101 struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
104 * Only IP is currently supported
107 if(hip->snap.ethertype != htons(ETH_P_IP))
109 printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
114 * We don't support dynamic ARP on HIPPI, but we use the ARP
115 * static ARP tables to hold the I-FIELDs.
117 return arp_find(hip->le.daddr, skb);
122 * Determine the packet's protocol ID.
125 __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
127 struct hippi_hdr *hip;
129 hip = (struct hippi_hdr *) skb->data;
132 * This is actually wrong ... question is if we really should
133 * set the raw address here.
135 skb->mac.raw = skb->data;
136 skb_pull(skb, HIPPI_HLEN);
139 * No fancy promisc stuff here now.
142 return hip->snap.ethertype;
145 EXPORT_SYMBOL(hippi_type_trans);
147 static int hippi_change_mtu(struct net_device *dev, int new_mtu)
150 * HIPPI's got these nice large MTUs.
152 if ((new_mtu < 68) || (new_mtu > 65280))
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.
162 static int hippi_mac_addr(struct net_device *dev, void *p)
164 struct sockaddr *addr = p;
165 if (netif_running(dev))
167 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
171 static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
173 /* Never send broadcast/multicast ARP messages */
176 /* In IPv6 unicast probes are valid even on NBMA,
177 * because they are encapsulated in normal IPv6 protocol.
178 * Should be a generic flag.
180 if (p->tbl->family != AF_INET6)
185 static void hippi_setup(struct net_device *dev)
187 dev->set_multicast_list = NULL;
188 dev->change_mtu = hippi_change_mtu;
189 dev->hard_header = hippi_header;
190 dev->rebuild_header = hippi_rebuild_header;
191 dev->set_mac_address = hippi_mac_addr;
192 dev->hard_header_parse = NULL;
193 dev->hard_header_cache = NULL;
194 dev->header_cache_update = NULL;
195 dev->neigh_setup = hippi_neigh_setup_dev;
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.
202 dev->type = ARPHRD_HIPPI;
203 dev->hard_header_len = HIPPI_HLEN;
205 dev->addr_len = HIPPI_ALEN;
206 dev->tx_queue_len = 25 /* 5 */;
207 memset(dev->broadcast, 0xFF, HIPPI_ALEN);
211 * HIPPI doesn't support broadcast+multicast and we only use
212 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
218 * alloc_hippi_dev - Register HIPPI device
219 * @sizeof_priv: Size of additional driver-private structure to be allocated
220 * for this HIPPI device
222 * Fill in the fields of the device structure with HIPPI-generic values.
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.
229 struct net_device *alloc_hippi_dev(int sizeof_priv)
231 return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
234 EXPORT_SYMBOL(alloc_hippi_dev);