235 lines
6.1 KiB
C
235 lines
6.1 KiB
C
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* HIPPI-type device handling.
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*
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* Version: @(#)hippi.c 1.0.0 05/29/97
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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* Florian La Roche, <rzsfl@rz.uni-sb.de>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Jes Sorensen, <Jes.Sorensen@cern.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/hippidevice.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <net/arp.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/checksum.h>
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#include <asm/system.h>
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/*
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* Create the HIPPI MAC header for an arbitrary protocol layer
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*
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* saddr=NULL means use device source address
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* daddr=NULL means leave destination address (eg unresolved arp)
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*/
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static int hippi_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, void *daddr, void *saddr,
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unsigned len)
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{
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struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
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if (!len){
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len = skb->len - HIPPI_HLEN;
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printk("hippi_header(): length not supplied\n");
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}
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/*
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* Due to the stupidity of the little endian byte-order we
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* have to set the fp field this way.
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*/
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hip->fp.fixed = __constant_htonl(0x04800018);
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hip->fp.d2_size = htonl(len + 8);
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hip->le.fc = 0;
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hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
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hip->le.message_type = 0; /* Data PDU */
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hip->le.dest_addr_type = 2; /* 12 bit SC address */
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hip->le.src_addr_type = 2; /* 12 bit SC address */
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memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
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memset(&hip->le.reserved, 0, 16);
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hip->snap.dsap = HIPPI_EXTENDED_SAP;
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hip->snap.ssap = HIPPI_EXTENDED_SAP;
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hip->snap.ctrl = HIPPI_UI_CMD;
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hip->snap.oui[0] = 0x00;
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hip->snap.oui[1] = 0x00;
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hip->snap.oui[2] = 0x00;
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hip->snap.ethertype = htons(type);
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if (daddr)
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{
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memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
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memcpy(&skb->private.ifield, daddr + 2, 4);
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return HIPPI_HLEN;
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}
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return -((int)HIPPI_HLEN);
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}
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/*
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* Rebuild the HIPPI MAC header. This is called after an ARP has
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* completed on this sk_buff. We now let ARP fill in the other fields.
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*/
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static int hippi_rebuild_header(struct sk_buff *skb)
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{
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struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;
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/*
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* Only IP is currently supported
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*/
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if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
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{
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printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
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return 0;
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}
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/*
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* We don't support dynamic ARP on HIPPI, but we use the ARP
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* static ARP tables to hold the I-FIELDs.
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*/
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return arp_find(hip->le.daddr, skb);
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}
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/*
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* Determine the packet's protocol ID.
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*/
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unsigned short hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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struct hippi_hdr *hip;
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hip = (struct hippi_hdr *) skb->data;
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/*
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* This is actually wrong ... question is if we really should
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* set the raw address here.
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*/
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skb->mac.raw = skb->data;
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skb_pull(skb, HIPPI_HLEN);
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/*
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* No fancy promisc stuff here now.
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*/
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return hip->snap.ethertype;
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}
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EXPORT_SYMBOL(hippi_type_trans);
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static int hippi_change_mtu(struct net_device *dev, int new_mtu)
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{
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/*
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* HIPPI's got these nice large MTUs.
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*/
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if ((new_mtu < 68) || (new_mtu > 65280))
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return -EINVAL;
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dev->mtu = new_mtu;
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return(0);
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}
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/*
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* For HIPPI we will actually use the lower 4 bytes of the hardware
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* address as the I-FIELD rather than the actual hardware address.
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*/
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static int hippi_mac_addr(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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if (netif_running(dev))
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return -EBUSY;
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memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
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return 0;
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}
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static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
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{
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/* Never send broadcast/multicast ARP messages */
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p->mcast_probes = 0;
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/* In IPv6 unicast probes are valid even on NBMA,
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* because they are encapsulated in normal IPv6 protocol.
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* Should be a generic flag.
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*/
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if (p->tbl->family != AF_INET6)
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p->ucast_probes = 0;
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return 0;
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}
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static void hippi_setup(struct net_device *dev)
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{
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dev->set_multicast_list = NULL;
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dev->change_mtu = hippi_change_mtu;
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dev->hard_header = hippi_header;
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dev->rebuild_header = hippi_rebuild_header;
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dev->set_mac_address = hippi_mac_addr;
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dev->hard_header_parse = NULL;
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dev->hard_header_cache = NULL;
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dev->header_cache_update = NULL;
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dev->neigh_setup = hippi_neigh_setup_dev;
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/*
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* We don't support HIPPI `ARP' for the time being, and probably
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* never will unless someone else implements it. However we
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* still need a fake ARPHRD to make ifconfig and friends play ball.
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*/
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dev->type = ARPHRD_HIPPI;
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dev->hard_header_len = HIPPI_HLEN;
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dev->mtu = 65280;
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dev->addr_len = HIPPI_ALEN;
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dev->tx_queue_len = 25 /* 5 */;
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memset(dev->broadcast, 0xFF, HIPPI_ALEN);
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/*
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* HIPPI doesn't support broadcast+multicast and we only use
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* static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
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*/
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dev->flags = 0;
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}
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/**
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* alloc_hippi_dev - Register HIPPI device
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* @sizeof_priv: Size of additional driver-private structure to be allocated
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* for this HIPPI device
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*
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* Fill in the fields of the device structure with HIPPI-generic values.
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*
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* Constructs a new net device, complete with a private data area of
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* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
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* this private data area.
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*/
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struct net_device *alloc_hippi_dev(int sizeof_priv)
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{
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return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
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}
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EXPORT_SYMBOL(alloc_hippi_dev);
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